Support reliable water supply, protect process delivery, and preserve the materials that make your sheet. Explore filtration around the mill, from incoming water to finishing.
Keep useful fibre. Control unwanted contamination.
For pulp producers, paper and board mills, tissue operations and coating teams. Follow eight application routes to identify the separation duty and the evidence needed for a filter trial.
These maps describe representative process logic, not complete plant designs. Product links identify candidates for evaluation, not proven interchangeable replacements. Actual fluid composition, temperature and equipment requirements determine suitability.
Pulp mills • paper machines • board and tissue
Incoming mill & process water
Source-water variation can carry suspended matter into mill services. Separate bulk treatment from final particle control, then set the outlet target for each receiving process rather than using one specification for every water user.
Process map / Incoming mill & process waterFollow steps 01–06
01Source waterCharacterize seasonal quality
02Primary treatmentClarification / screening as required
03Treated-water bufferMaintain water quality
04Particle filtrationSelect for the downstream duty
05Release checkConfirm the receiving specification
06Dedicated mill serviceSupply the intended user
↳ Primary-treatment rejects and filter wastes follow the mill’s handling route. A separate utility-water branch may require further dissolved-species treatment.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
Sediment removal does not establish colour, dissolved-salt or microbiological control. Those requirements need their own treatment and verification.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Bulk treatment
Manage incoming solids before polishing.
Review existing treatment performance during source-water changes.
Particle control
Match filtration to the receiving equipment.
Evaluate high-flow, pleated or depth cartridges; a bag may suit a coarse duty.
Acceptance
Demonstrate stable outlet quality.
Record upstream/downstream samples and clean-to-terminal pressure difference at actual flow.
Water-quality history; equipment feed limits; element efficiency and sizing data; wetted-material review.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
White water contains useful fibre and fines as well as water. A recovery stage separates reusable solids from filtrate; further treatment depends on where that filtrate will go. A disposable cartridge belongs only in a justified polishing duty after bulk recovery.
Process map / White-water recovery & reuseFollow steps 01–06
01Collected white waterDrainage from sheet formation
02Fibre recoverySave-all or suitable recovery system
03Selected filtrateSegregate by measured quality
04Reuse treatmentAdditional treatment where required
05Water verificationCheck the intended reuse target
06Approved reuseReturn to the designated service
↳ Recovered fibre returns to the appropriate stock circuit. Cloudy filtrate, clear filtrate and treatment rejects have different destinations; the diagram follows only the selected reuse-water stream.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
No PARSWOOD save-all, disc-filter sector or white-water ultrafiltration replacement is verified here. Particle polishing alone does not remove all dissolved or colloidal contaminants.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Recovery
Retain useful fibre in the production process.
Review the installed recovery equipment and filtrate quality before selecting a downstream element.
Polishing candidate
Control residual particles where justified.
Trial a high-flow or pleated liquid element only on a suitable clarified stream; assess fouling and operating cost.
Reuse verification
Match water to its destination.
Agree solids, chemistry and biological criteria with the receiving process.
Water-balance diagram; recovery performance; filtrate analysis; reuse criteria; pilot throughput and pressure history.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Water-borne particles can interfere with spray delivery and flushing. Define the requirement at the nozzle or seal, then review the feed source, filtration location and pressure available to that user.
Process map / Shower, spray & seal waterFollow steps 01–06
01Approved water feedFresh or qualified recovered water
02Bulk particle controlWhere feed loading requires it
03Selected water filterMatch nozzle / seal requirements
04Delivery controlsMaintain specified flow and pressure
05Point of useShower or approved flushing service
06Performance checkInspect delivery and condition
↳ This map follows the water supply. The discharge returns to the appropriate process or collection system; it does not automatically return to the clean-water feed.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
Shower and seal-water specifications may differ. Do not use an arbitrary fraction of nozzle diameter as a universal filter grade, or assume recovered water suits every high-pressure shower.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Feed selection
Avoid recurring blockage from an unsuitable source.
Review solids, fibres and deposits; identify whether contamination is generated upstream or in the distribution line.
Filter duty
Protect the specified delivery point.
High-flow or pleated cartridges may suit a defined particle target; assess depth media for compatible noncritical duties.
Service check
Maintain delivery after installation.
Record pressure downstream of the filter and inspect nozzle pattern or seal-service performance.
Equipment water specification; filter retention data; flow/pressure calculation; water samples; service inspection record.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Purchased liquid chemicals • dilution water • dedicated feed lines
Chemical-feed & bleach-plant preparation
Chemical storage and transfer can introduce particulate contamination before a feed reaches its destination. Evaluate each stream independently: dilution water, an acid feed and an oxidizing solution do not share an automatic materials approval.
Process map / Chemical-feed & bleach-plant preparationFollow steps 01–06
01Identify one feedComposition and concentration
02Dedicated storageUse the approved handling system
03Feed conditioningOnly as the process specifies
04Qualified particle filterIf required and compatible
05Feed-quality checkVerify concentration and cleanliness
06Metered process supplyTo the designated chemical user
↳ Each chemical follows its own dedicated line. The map does not direct incompatible feeds into a shared filter and does not show a bleach-agent generation recipe.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
No blanket filter recommendation is made for chlorine dioxide, concentrated acids or other oxidizing service. The complete element, seals and vessel must be qualified for the exact chemical and operating envelope.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Define the contaminant
Distinguish solids from dissolved impurities.
Obtain feed analysis and identify the cause of the process problem.
Qualify construction
Avoid selection by polymer name alone.
Request written compatibility and operating limits for every wetted component.
Verify the change
Preserve the chemical-feed specification.
Confirm cleanliness, concentration and delivery behaviour under the plant’s approved procedure.
Process information to review
Chemical identity and concentration; contaminants; temperature; pressure; flow; installed materials; feed-system requirements.
Specialist application review
No verified catalogue replacement is established for this duty. Send the installed specifications for review.
Documents and trial evidence
Chemical analysis and safety data; installed filter specification; written compatibility; vessel rating; process approval and trial criteria.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Paper and board • size-press supply • converting interfaces
Starch preparation & surface sizing
Surface-sizing systems need controlled preparation and delivery. Unwanted lumps or introduced debris must be distinguished from the material the formulation needs. Review the installed screening system before considering a disposable element.
Process map / Starch preparation & surface sizingFollow steps 01–06
01Prepared sizeFollow the approved preparation route
02Quality adjustmentCheck solids, viscosity and temperature
03Machine supply tankMaintain the specified condition
04Qualified screeningUse the established screen duty
05Air managementAt the designed circuit location
06Size applicationDeliver to the selected applicator
↳ Where the system recirculates, unused size returns through its specified return screening and conditioning circuit. Applied material continues with the sheet.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
The map starts with prepared size and is not a starch-cooking recipe. A bag or cartridge must not replace a pressure screen without proving temperature, viscosity, retention and supply performance.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Preparation review
Identify where contamination originates.
Compare upstream samples with screen rejects before changing the separation stage.
Supply screening
Preserve consistent applicator feed.
Keep the specified screen system; assess a bag candidate only for a separately qualified liquid-screening duty.
Quality trial
Check the result on the sheet.
Compare retained material, viscosity, solids, delivery and the accepted sizing-quality test.
Preparation and supply diagram; screen specification; bag-material limits if proposed; before/after formulation and sheet-quality results.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Coated paper • coated board • barrier-coating development
Coating colour & pigment-containing liquids
Useful pigment and binder must reach the sheet, while unwanted oversize material should be controlled. Establish the acceptable formulation first; a finer element can remove useful material or create an impractical pressure rise.
Process map / Coating colour & pigment-containing liquidsFollow steps 01–06
01Qualified componentsPigment, binder and other inputs
02Formulation mixingFollow the approved recipe
03Batch acceptanceSolids, rheology and quality
04Supply screeningControl unwanted oversize
05Conditioned deliveryAir management and stable supply
06Coating & inspectionEvaluate the finished surface
↳ Unused coating colour may return through a dedicated screening circuit. Recovery from coating effluent is a separate process; it is not equivalent to screening the main supply.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
No verified PARSWOOD coating-pressure-screen or coating-recovery membrane equivalent is established. Any disposable-filter trial must demonstrate pigment passage and finished-sheet quality.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Defect definition
Identify grit, agglomerates or foreign matter.
Separate formulation problems from external contamination before selecting a grade.
Candidate trial
Preserve the intended dispersed material.
A compatible bag may be evaluated for an appropriate coarse liquid duty; keep the approved supply screen until equivalence is demonstrated.
Acceptance
Check more than visual clarity.
Compare particle population, solids, rheology and the relevant coating finish or barrier-performance test.
Process information to review
Pigment/filler distribution; binder; solids; viscosity at use temperature; screen opening; flow; defect and end-product specification.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Steam generation • water treatment • energy systems
Boiler makeup & condensate interfaces
Particle pretreatment supports a larger boiler-makeup treatment system. Dissolved-ion removal and final feed conditioning have separate duties. Treat hot condensate return as another application with its own temperature and contamination requirements.
Process map / Boiler makeup & condensate interfacesFollow steps 01–06
04Dissolved-ion treatmentRO / demineralization as designed
05Final conditioningFollow the boiler-system design
06Feed-quality verificationRelease against the specified target
↳ Recovered condensate joins only at its designed interface after its own quality assessment. Off-spec condensate is handled under the site procedure rather than assumed acceptable for return.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
This map follows makeup water. The linked PP products are not automatically suitable for hot condensate or steam, and particle filtration does not establish boiler-feed quality.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Pretreatment
Protect downstream water-treatment equipment.
Evaluate high-flow, pleated or depth cartridges on a compatible feed within documented limits.
Condensate review
Identify corrosion products or other ingress.
Request a separate high-temperature filtration assessment; no general PP substitution is offered.
Verification
Check the complete feed specification.
Use the plant’s required water-chemistry measurements and equipment limits.
Process information to review
Source and treated-water analysis; downstream equipment; dosing; flow; temperature; operating pressure; condensate quality where relevant.
Water-treatment diagram; equipment feed limits; retention/sizing data; temperature derating; plant water-quality records.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Mill lubrication and hydraulic systems require equipment-specific contamination control. Particle retention, water removal and oil-condition monitoring are different functions. A process-water cartridge cannot be qualified for these duties by matching its nominal dimensions.
Process map / Hydraulic & bearing-lubrication systemsFollow steps 01–06
01Oil-condition sampleParticles, water and oil properties
06Approved serviceReturn through the designed circuit
↳ The map is a condition-review route, not a mandatory series installation. Offline treatment and hydraulic pressure-line filtration occupy different locations in the real system.
Teal: particle filtration · Funnel: screening or separation as labelled · Gold: verification. Conceptual treatment logic; pumps, valves and protective devices are not fully shown. Not an installation drawing.
No verified PARSWOOD hydraulic, bearing-oil or vacuum-dehydrator replacement is established in this guide. Retain the approved equipment pending a documented assessment.
Filtration stages and selection
Stage
Objective
PARSWOOD approach to evaluate
Particle control
Match retention and structural requirements.
Obtain efficiency, collapse strength, bypass and pressure-cycle specifications for the installed element.
Water contamination
Address the form and source of water.
Assess separate water-removal technology and correct ingress; a particle filter alone is not a dehydration system.
Condition verification
Demonstrate the equipment target.
Use representative oil sampling and the equipment supplier’s acceptance criteria.
Process information to review
Oil type and viscosity; water content; cleanliness target; pressure cycling; flow; bypass arrangement; equipment approval requirements.
Specialist application review
No verified catalogue replacement is established for this duty. Send the installed specifications for review.
Documents and trial evidence
Original element and vessel datasheets; oil analysis; retention test; collapse/bypass limits; water-removal specification if needed.
Start with the linked product specifications. Request missing grade-specific data through the application review; this page does not imply that every document is already available for download.
Pulp screening, cleaning, flotation and thickening handle useful fibres and process rejects. The liquid cartridges linked here do not replace those systems.
Kraft chemical recovery
Black liquor, green liquor and white liquor have different solids, chemistry and temperature duties. No recovery-filter or liquor-filter replacement has been verified here.
Effluent & reuse treatment
Suspended-solids removal alone does not establish control of dissolved organics, colour or discharge suitability. Review the full treatment train and receiving specification.
Paper intended for food contact needs appropriate material and process documentation. Filter selection alone does not certify the finished paper or packaging.
Compressed air & dust
Air quality, pneumatic systems and dust collection use purpose-designed equipment. General liquid filters are not substitutes.
Product fit / technical review
PARSWOOD candidates for selected liquid duties
Melt-blown PP cartridges
Initial particulate reduction in compatible water streams after bulk solids have been controlled.
The published efficiency table lists 85% for 1–5 µm grades and 90% for 10–100 µm grades. These are not absolute barriers. The listing gives a 65°C maximum operating temperature and 2.0 bar maximum differential pressure at 20°C; confirm the selected construction and derating.
Published efficiencies are not absolute barriers. Verify temperature and chemical limits; this is not a pulp-stock or fibre-recovery element.
Defined fine-particle duties in compatible water and individually reviewed liquid feeds.
Published grades span 0.1–50 µm. The listing identifies process-water and plating-chemical applications. Obtain the test method, retention efficiency and pressure/temperature limits for the exact grade.
Confirm the retention test and the complete wetted construction. No generic approval for bleach chemicals, hot condensate or coating colour is implied.
Coarse liquid screening trials where nominal retention and a bag format suit the process.
The listing offers PP, PET and nylon media and different seal-ring constructions. Ratings are nominal. Select the material for the actual chemistry and temperature, and verify the supporting basket and seal.
Test the real formulation and verify ring, basket and seal. A bag is not an automatic replacement for a pressure screen or self-cleaning strainer.
Higher-flow particle control in compatible mill-water and utility-water circuits.
The listing includes several formats, nominal/absolute options and different constructions. Select one exact model; confirm dimensions, flow direction, seals and retention data before comparing it with the installed element.
The catalogue supports water-treatment duties, not a blanket pulp-mill approval. Select the exact construction, flow direction, retention grade and seals.
Contain and seal the selected element in a documented liquid-filtration installation.
Confirm vessel materials, pressure/temperature rating, connections, vent/drain arrangement and element retention. Review installation space and safe change-out access.
Confirm corrosion resistance, pressure/temperature rating and cleanability. No automatic approval for oxidizing chemicals, steam, hot liquor or hydraulic pressure lines.
Record feed quality, actual flow, temperature, pressure difference, throughput and outlet quality. For sizing or coating fluids, include useful-solids retention and finished-sheet acceptance. Agree the trial criteria before changing production equipment.
