ECOFILTRONE™ supplies pleated filter cartridges for industrial liquid filtration from our plant in Qingdao, China, in PP, glass fiber, polyester and PTFE media across eight catalog series. Each pleated cartridge is matched to your fluid, temperature, micron rating and housing before it ships. Send your filtration duty and an engineer returns a written quote within 24 hours.
We offer pleated filter cartridges in four product families. Pick the family by filtration media and temperature first, then narrow by micron rating and end cap. The same logic covers a pleated water filter cartridge for RO pretreatment and a pleated membrane filter for vents and chemicals.
The four series for process water, RO pretreatment and final polishing are all made of polypropylene, for duties where PP media and hardware suit the chemistry.
The ECBS series is built for clarifying process water and prefiltering gases and vents, using glass fiber media with a polypropylene frame and hardware.
The three series for hot liquids, solvents and steam-sterilized lines run from polyester to all-fluoropolymer construction.
Replacement cartridges are built around the housing you already run, with the plug-in end and closed end matched to your old part.
We specialize in producing filter cartridges in Qingdao for industrial filtration of water and process liquids. With an engineering team on site, we check the filtration duty before we quote rather than after the first change-out goes wrong. We deliver filter cartridges to end-users, OEMs, and distributors.
The media, the hardware and the seal come in contact with your fluid; therefore, all three elements define each series. A 69 mm (2.72 in) pleated element provides more dirt-holding capacity than a wound element of the same size. The synthetic media of these series does not swell like cellulose.
Multi-layer media stacks a coarse layer over a fine one, a construction described in patent literature on multi-layer pleated filter media. The coarse layer holds larger particles so the fine layer is not the first thing to clog.
A chemical compatibility chart for these series is not something we publish, and even if it were, it would not settle your case. ASTM D543 evaluates plastics against the actual reagent, concentration, temperature and contact time, so we ask for those four values before recommending a media and seal (ASTM D543-21).
| If your duty is | Start with | Deciding number |
|---|---|---|
| Water or mild aqueous fluid below 80 °C, rating stated as nominal | CE | 0.1–100 µm, 80 °C (176 °F) |
| Final filtration needing an absolute rating | ECFG | 0.1–50 µm absolute |
| Mixed particle sizes that blind single-layer media | ECSG | Graded 0.1–20 µm |
| Hot liquid between 80 °C and 120 °C | THF | 120 °C (248 °F), 4.0 bar at 80 °C |
| Solvent or strong chemical up to 160 °C | ECTF | 160 °C (320 °F), 2.0 bar at 120 °C |
| Gas or vent line needing a fine membrane | ECPTFE | 0.01 µm gas rating, 135 °C steam |
Not sure where your duty lands? The Pleated Family Router asks four questions and returns a series shortlist with a quote summary you can copy.
Pleated Family Router →A seal helps prevent liquids from bypassing a filter element. The two ends of a filter element, however, determine its effectiveness: the plug-in end carries the O-ring into the housing socket, and the closed end locates the far side.
Our catalog lists 18 end cap codes, grouped here by the plug-in end. Codes 222 and 226 take their names from the SAE AS568 dash numbers of the O-rings on that end; the standard sizes the rings, not the cartridge (SAE AS568F).
| Code | Plug-in end | Closed end | Reinforcing insert |
|---|---|---|---|
| F | Double open end (DOE) | Open, both ends | No insert |
| M | 222 O-rings | Flat | No insert |
| P | 222 O-rings | Fin | No insert |
| W | 222 O-rings | Spear fin | No insert |
| N | 222 O-rings, extended | Flat | No insert |
| E | 222 O-rings, extended | Fin | No insert |
| J | 222 O-rings | Flat | Stainless steel |
| K | 222 O-rings | Fin | Stainless steel |
| X | 222 O-rings | Spear fin | Stainless steel |
| T | 226 O-rings | Flat | No insert |
| Q | 226 O-rings | Fin | No insert |
| Y | 226 O-rings | Spear fin | No insert |
| I | 226 O-rings | Flat | PSU |
| G | 226 O-rings | Fin | PSU |
| V | 226 O-rings | Flat | Stainless steel |
| R | 226 O-rings | Fin | Stainless steel |
| Z | 226 O-rings | Spear fin | Stainless steel |
| H | 213 O-rings | Flat | No insert |
Many buyers order a DOE filter cartridge, or a cartridge for a Code 7 filter housing, by the housing maker’s code. Those codes are not interchangeable across housing brands, so we reference your old cartridge filter, its O-ring size and the housing model rather than relying on the code alone.
Diameters are 69 mm (2.72 in) for the CE, ECFG, ECSG, ECPGA, ECBS, ECTF and ECPTFE series and 152 mm (6.0 in) for THF. Lengths run 5–40 in (127–1016 mm), 4–40 in on ECTF, and 1026, 1524 or 1540 mm on THF.
The joint between media pack and end cap is where a pleated cartridge is most often redesigned; patent families on end cap attachment and potted end caps show why. We weld PP end caps where the series allows, so there is no adhesive in contact with the fluid on those elements.
Get Instant Quote →The Nine-Row Pleated Series Crosswalk provides a compilation of all series on a single Crosswalk. Pressure figures are the catalog’s maximum allowable operating differential pressure at the stated temperature. These values do not represent the clean pressure drop, the change-out point or the collapse pressure.
| Series | Media and hardware | Rating | Max temperature | Max operating differential pressure | Diameter × length | Steam or hot water |
|---|---|---|---|---|---|---|
| CEPP | PP | Nominal 0.1–100 µm | 80 °C (176 °F) | 4.0 bar (58 psi) at 20 °C; 2.0 bar (29 psi) at 80 °C |
69 mm × 5–40 in | Not rated |
| ECFG | PP, welded | Absolute 0.1–50 µm | 80 °C (176 °F) | 4.0 bar (58 psi) at 20 °C; 2.0 bar (29 psi) at 80 °C |
69 mm × 5–40 in | Not rated |
| ECSG | Multi-layer PP | 0.1–20 µm | 80 °C (176 °F) | 4.0 bar (58 psi) at 20 °C; 2.0 bar (29 psi) at 80 °C |
69 mm × 5–40 in | Not rated |
| ECPGA | Fine-fiber PP | Submicron, per quote | 80 °C (176 °F) | 4.0 bar (58 psi) at 20 °C; 2.0 bar (29 psi) at 80 °C |
69 mm × 5–40 in | Repeated hot-water sanitization |
| ECBS | Glass fiber / PP | 0.45–20 µm, six grades | 80 °C (176 °F) | 4 bar (58 psi) at 20 °C; 2.0 bar (29 psi) at 80 °C |
69 mm × 5–40 in | Not rated |
| THF | PBT and glass fiber / polyester | 0.5–20 µm | 120 °C (248 °F) | 4.0 bar (58 psi) at 80 °C | 152 mm × 1026, 1524 or 1540 mm | Not rated |
| ECTF | PTFE membrane / PFA | 30 nm to 5 µm | 160 °C (320 °F) | 5.0 bar (73 psi) at 20 °C; 2.0 bar (29 psi) at 120 °C |
69 mm × 4–40 in | 135 °C (275 °F), 30 min |
| ECPTFE, liquid | PTFE membrane / PP | 0.22 µm | 100 °C (212 °F) | 5.2 bar (75 psi) at 20 °C; 2.4 bar (35 psi) at 80 °C |
69 mm × 5–40 in | 135 °C (275 °F), 30 min, 150 cycles |
| ECPTFE, gas | PTFE membrane / PP | 0.01 µm | 100 °C (212 °F) | 5.2 bar (75 psi) at 20 °C; 2.4 bar (35 psi) at 80 °C |
69 mm × 5–40 in | 135 °C (275 °F), 30 min, 150 cycles |
In the filter industry, the gap between a micron figure in a catalog and the figure actually measured can be large. This is because liquid cartridge manufacturers do not use uniform methods to assess “nominal” and “absolute” figures. As such, ECOFILTRONE™ keeps each catalog label as printed and states the rating basis when the order is released.
Use the Beta Ratio Efficiency Converter to standardize any beta value a supplier provides. Then you can evaluate beta ratios provided by multiple suppliers in the same unit.
We price each order by series, media, micron rating, length, end cap and quantity. There is no fixed list for configured cartridges, so your price comes back in a written quote within 24 hours.
| Driver | Effect on cost | How to reduce it |
|---|---|---|
| Media | PTFE membrane with PFA hardware costs far more than PP media | Use PTFE only where the fluid or temperature rules PP out |
| Rating basis | An absolute rating costs more than a nominal one | Reserve absolute ratings for the final stage |
| End cap | Stainless steel or PSU inserts add parts and assembly time | Specify an insert only where the housing spring needs it |
| Length and quantity | Longer elements and small runs raise the unit price | Group lengths and order against a forecast |
| Order stage | Lead time | What it covers |
|---|---|---|
| Quotation | Within 24 hours | Series, rating, end cap and price confirmed in writing |
| Stock standard items | 4–5 days | Catalog configurations held in stock |
| Custom sample | 7 days | A sample built to your configuration, counted from the day it is confirmed |
| Custom batch production | 14 days | Production run after technical confirmation |
A pleated element usually costs more per piece than a melt-blown one. Still, the cartridge price is the wrong way to measure what filtration really costs you. Change-out labor, downtime and a membrane you didn’t have to clean tend to outweigh the element itself.
Minimum order quantity is set per product; we accept trial orders, and custom configurations start at 100 pieces. Samples are free; the buyer pays freight.
Inspections are integrated throughout the process, not added on at the end. Every pleated filter element is checked against the configuration you approved at technical confirmation.
Incoming media and hardware checked against the series specification
Dimensional check against your housing data for diameter, length and end cap geometry
Integrity check on pleat pack, seams and end caps
Flow and filtration performance verification for the series and rating ordered
A correct micron rating but wrong O-ring size will result in no filtration.
ECOFILTRONE™ Application Engineering, Qingdao
Technical datasheets and drawings ship with the order; material certificates and compliance documents are supplied after we verify them for the specific product.
An element that does not match the approved configuration is traced through the same dimensional and integrity records used at release. Corrections are made to the batch against those records.
Request a free sample configured to your housing; we confirm the configuration first, then ship it within 7 days.
Request a free sampleFluid, temperature, flow, pressure and the particle you need to stop.
Series, rating basis, length and end cap, with the reason for each.
A free sample built to the configuration, shipped within 7 days.
We confirm dimensions, end cap and seal against your housing data before production.
14 days for custom batches, 4–5 days for stock items.
We can modify your rating or staging if your service records show an element loading early.
The greatest opportunity for savings is in Step 6. If there is low flow with high pressure, it means the cartridge is loaded, and it is not a pump fault. This change-out point should be determined by the process rather than by the calendar.
In a pleated design, pleats that lose their spacing let liquid take the path of least resistance, which is bypass even with a correct seal. Supported pleat packs and differentials matched to temperature prevent this from happening.
Build your duty sheet before step 1 with the Filtration Duty Sheet; it formats the fields we need into one summary you can paste into an email or RFQ.
Get Filtration Duty Sheet →Photos below are samples of our pleated filter cartridges from each series.
absolute-rated PP, welded end caps
multi-layer graded PP media
fine-fiber PP, packed for export
152 mm polyester, up to 120 °C
Pleated water filters and process elements are surface filters that capture each contaminant particle on the face of the media. Finer is not always safer, and a pleated stage in the wrong place costs you cartridges without lowering contamination downstream.
The surface blinds before the media depth is used, so change-outs come early.
A melt-blown depth cartridge or filter bag upstream; the pleated cartridge belongs there instead as the final stage.
Too fine upstream shortens life; in one forum thread 20 µm and 5 µm stages missed fine iron until a 1 µm pleated stage was added after chlorine injection.
Stage coarse to fine, with the finest rating last.
Many 69 mm (2.72 in) elements in parallel mean a large housing and long change-outs.
A large-diameter high flow filter cartridge sized for the flow rate.
A pleated rating label is not a sterility claim.
A membrane cartridge validated for your process.
Above the highest polymer rating in this family (ECTF).
A sintered metal or stainless steel mesh element.
Determine the optimal pleated filter series based on your specific application, fluid compatibility, and exact flow rate requirements.
Quickly convert between Beta ratio values and absolute filtration efficiency percentages for precise micron rating specifications.
Standardize your technical requirements and operational parameters to streamline the cartridge selection and quotation process.
Send these details and we return series, rating, end cap, price and lead time within 24 hours.
Fluid and concentration, viscosity and temperature
Flow rate, inlet pressure and allowable differential pressure
Solids content or particle size distribution and the particle you wish to eliminate
Rating and rating basis (nominal or absolute)
Cartridge length, end cap code or housing model
Quantity and required delivery date
Prefer to prepare offline? Use the Filtration Duty Sheet or reach us through our contact page.
A pleated cartridge is a surface filter with a large surface area and a defined rating, while a melt-blown cartridge captures particles within the wall of the filter. Pleated filters allow for a greater flow rate but cannot filter as high a solids load as a depth filter. Most plants use a depth filter first and a pleated filter last.
RO feed water is prefiltered before the membranes so suspended solids stay within design limits (FDA). A 2018 Water Technology review describes a 5 µm cartridge as the common prefilter, with some RO designers adding a 1 µm absolute pleated stage where fouling is costly. Follow your membrane maker’s feed limits first.
Our elements are designed for replacement, and pleats can be disrupted with backwashing or rinsing. ECPGA tolerates repeated hot-water sanitization, and ECTF and ECPTFE accept in-line steam at 135 °C (275 °F) for 30 minutes. Sanitization should not be confused with element cleaning.
ECTF has seal options of PFA/PTFE and E-FKM and F-FKM, and on many chemical duties the seal fails before the media. Hence, it is equally essential to assess the media and the elastomeric seal. We verify the elastomer against your process fluid.
222 and 226 refer to the AS568 dash numbers of the O-rings on the plug-in end; 226 is the larger ring. Code 7 is housing makers’ shorthand for an end cap style and is not standard across all manufacturers. Send us the old cartridge’s markings or a photo of its end, and we match the code from our 18 options.
Yes. Samples are free; the buyer pays freight, and a custom sample ships within 7 days once its configuration is confirmed.
A 30% deposit with the order and the 70% balance before shipment. We ship EXW, FOB or CIF.
A nominal rating means the media captures part of the particles at that size, while an absolute rating claims near-complete retention at that size under a stated test. With liquid filtration, there is no single standard test behind either label, so the test basis is as important as the number. Ratings from different suppliers should not be compared without evaluating the test basis.
The life of a filter element depends on solids loading, flow and temperature, so it is measured in differential pressure, not hours. The element should be replaced before the maximum allowable differential pressure is reached. Logging pressure from the first installation tells you the real interval within one or two cycles.
Above 80 °C (176 °F), PP series are out; THF runs to 120 °C (248 °F) and ECTF to 160 °C (320 °F). For aromatic solvents, all-fluoropolymer construction is the usual starting point, which in our range means ECTF with PFA hardware. Send the solvent, concentration and temperature so we can confirm media and seal.
They will when diameter, length, plug-in end and closed end match your housing, and we confirm those against your old cartridge before production. Dimensional compatibility only means the element installs. Flow, differential pressure and fluid compatibility still have to be checked, and a free sample settles it in service.
Within 24 hours of receiving your filtration duty. The quote states the series, rating, length, end cap, price and lead time.
Minimum order is set per product, trial orders are accepted, and custom configurations start at 100 pieces. Stock items ship in 4–5 days and custom batches in 14 days after technical confirmation.
Technical datasheets and drawings ship with every order. Material certificates and compliance documents are supplied after verification for the specific product.
