Jiangsu Angkua Environmental Protection Technology Co., Ltd. manufactures pool and spa filter cartridges and filtration elements for private pools, hot tubs, swim spas, hotel leisure facilities and municipal aquatic centres. The range covers pleated cartridges, replacement elements and the cores, end caps and gaskets that hold them together, produced at our Nantong, Jiangsu works and supplied to OEM brands, distributors and project contractors. We work from drawings, physical samples or OEM part references, and we are a China-based Pool Spa Filter manufacturer positioned on cartridge and element production rather than on trading.
Pool and Spa Filter Cartridges We Supply
- Pool cartridge elements — large-area pleated cartridges for residential and commercial cartridge filter bodies, supplied singly or as full banks.
- Spa and hot tub cartridges — compact elements with threaded, slip or bayonet ends, sized to standard spa filter bodies and swim-spa skids.
- Replacement elements — dimension-matched cartridges for aftermarket programmes, cross-referenced to OEM filter numbers.
- Shared media technology — the same pleating and bonding lines feed our Composite Filter Element and Water Purification System ranges, which matters when one customer buys across several water treatment categories.
- Brand programmes — private-label printing, box artwork and mixed cartons, described within our full water filtration range.
Matching Filtration Duty to the Water Body
Pool water is cleaned either by depth media with a backwash cycle or by surface cartridges that are rinsed or replaced. The choice sets the plant-room plumbing, the consumable budget and the achievable clarity, so we confirm the filtration basis before cartridge dimensions are fixed.
| Filtration basis |
Typical interception |
Backwash water use |
Best-fit duty |
| Sand or glass media |
20–40 µm, tighter with flocculant or active glass media |
High; 2–5 minutes at rated pump flow per backwash, with a drain line |
High-volume public and semi-public pools where simple maintenance dominates |
| Pleated cartridge |
10–15 µm nominal |
None; cartridges are rinsed or replaced, no drain required |
Residential pools, hot tubs, swim spas, heated indoor pools with tight plant rooms |
| Diatomaceous earth |
2–5 µm |
Moderate; D.E. powder is recharged after each backwash |
Projects chasing maximum clarity and fine particle capture |
Media, Cores and Connection Configurations
Cartridge performance is decided by pleat geometry and media grade as much as by the filter body. Heavier media and more pleats raise dirt-holding capacity but also raise clean pressure drop, so we set area against the pump curve rather than maximising one number.
- Media — spunbonded polyester pleat media, non-woven polyester and microfibre grades for fine polish filtration.
- Cores — extruded PVC or polypropylene, sized to resist collapse across the full differential pressure range.
- End caps — plastisol or polyurethane bonding for leak-free pleat sealing.
- Sealing — Buna-N, EPDM or silicone gaskets and O-rings selected for the sanitising chemistry in use.
- Connections — 1.5 in, 2 in and 2.5 in NPT threads, coarse and fine thread patterns, slip and bayonet ends.
Specification Variables We Fix Before Production
| Variable |
Options |
What it controls |
| Dimensions and end-cap geometry |
OEM-matched length and outside diameter, top or bottom load |
Fit in the filter body, seal compression, bypass risk |
| Effective filtration area |
Compact spa elements through to large pool cartridges banked in groups |
Turnover time, cleaning interval, clean pressure drop |
| Media grade |
Standard pleated polyester, heavy-duty grades, microfibre polish layers |
Micron rating and dirt-holding capacity against flow |
| Thread and gasket |
NPT sizes, coarse or fine thread, Buna-N / EPDM / silicone seals |
Thread engagement, tool-free removal, chemical compatibility |
| Duty conditions |
Hot-tub temperatures and standard pool plant-room pressures |
Media stability, seal life, safe operating envelope |
Line Integration and Control Interfaces
Cartridge filtration is mechanically simple: the housing sits on the return line after the pump and heater, and the interface is flow, differential pressure and maintenance access. Sand and D.E. vessels add a multiport valve, so the control scope grows to backwash sequencing, actuator signals and drain routing.
- Differential pressure gauge or transducer across the cartridge bank to trigger cleaning.
- Pump and heater interlock so the circuit cannot run dry or heat against a blocked element.
- Valve, bypass and drain positions for projects that combine cartridge and D.E. filtration.
- Access clearance for cartridge removal, matched to the plant-room layout.
Quality Control, Acceptance and Compliance
Acceptance is against the approved sample and the signed dimensional drawing. Batch control covers the measurements that decide fit and flow: pleat count and depth, effective media area, end-cap bond integrity, gasket seating, thread gauge and overall dimensions.
Compliance references used across our water treatment products include NSF/FDA and the standards DIN8077, DIN8078, ISO15874 and GB/T18742, with factory management under ISO9001 and ISO14001 systems. Where a project needs certification evidence for a specific cartridge, the applicable reference is confirmed in the quotation so the correct documents travel with the order.
Installation, Cleaning and Spare Parts
Cartridges are cleaned by rinsing between the pleats with a low-pressure jet, then returned once the differential pressure reading falls back towards its clean baseline. Replacement intervals follow pressure rise, bather load and chemistry rather than a fixed calendar, and we supply matched spare cartridge sets for the installed housing so a project is never left mid-season with a mismatched element.
- Salt, ozone, chlorine and bromine duty confirmed before media and elastomer selection.
- Outdoor installations checked for UV exposure and ambient temperature swings.
- Spare cores, gaskets and O-rings offered alongside the cartridges for scheduled maintenance.
Information We Use to Configure Your Solution
A firm cartridge proposal rests on the following project inputs. Where a value is open, we state the assumption used in the drawing.
- Water body volume, turnover target and pump flow at operating head.
- Filter body model, OEM part number, housing drawing or a physical sample.
- Required cartridge length, outside diameter, thread type and end-cap pattern.
- Filtration target, media grade and acceptable clean pressure drop.
- Sanitising chemistry, water temperature and expected bather load.
- Annual quantity, packaging format, labelling and destination market.
Packing, Labelling and Documentation
Cartridges are packed individually or in bulk cartons with the approved label artwork, then palletised for container loading; labelling can carry our customer's brand rather than ours. The order documentation follows the approved sample, the dimensional drawing and the batch inspection record, so receiving inspection can be matched against the same figures used on the line.
Frequently Asked Questions
Can you produce cartridges for a specific spa or pool filter body?
Yes. Send the OEM part number, a drawing or a used cartridge, and we measure thread form, end-cap geometry, media grade and pleat count, then produce a sample for approval before mass production.
Which media do you use for hot tub and spa cartridges?
Spunbonded polyester pleat media and non-woven polyester are standard, with microfibre grades for finer polish. The pleat count and effective area are set to balance dirt-holding capacity against the pressure drop the circulation pump can carry.
Do cartridge filters need a backwash cycle?
No. Maintenance is rinsing or replacement, so no backwash drain line is required. This suits heated indoor pools and saltwater systems where draining warm water would waste energy and water.
How many cartridges are needed for a given flow rate?
Sizing follows turnover time, pump flow at operating head and the effective area of each element. Provide the water volume and the pump curve and we return a cartridge count, bank layout and expected cleaning interval.
Are the cartridges suitable for salt, ozone and bromine systems?
Media and elastomers are selected against the sanitising chemistry. High-residual ozone and concentrated bromine affect seal materials differently from chlorine, so the chemistry is confirmed before gaskets are specified.
What documentation accompanies a cartridge order?
The approved sample record, the dimensional drawing, the batch inspection data and the material declaration for the media and elastomers. Certification references applicable to the product are stated in the quotation.
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