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Pure Spa Cartridge Filter - NORTH

Replaces: PWW35L, MA36, 4CH-935

Extended 1 Year Warranty

In addition to the manufacturers standard warranty (usually 1 year) we also offer the opportunity for you to extend this warranty by a further 1 year for a one off fee. This can be arranged at the point of purchase or within a limited time afterwards.
An extended warranty is an easy way to protect your purchase, against any manufacturing defects causing breakdown. You will benefit from free repairs for the term of the warranty period & If your equipment can't be repaired then we will replace it free of charge.(A delivery surcharge may apply for non UK mainland addresses)
This warranty and the standard manufacturer’s warranty does not cover general wear and tear, abuse or misuse or incorrect installation.
If you would like any further information on our extended warranty scheme please call our Hydrospares team on 01326 371 488 OR email us at info@hydrospares.co.uk

LID: 5139
Official Branded
35 Sq Ft
Reemay
Replacement Filter
FIL-8025M
PS-WW35
19 In StockSame day dispatch if ordered by 14:00
Fast UK Delivery
Pure Spa Cartridge Filter - NORTH
£29.99
RRP £42.80

Premium Filtration Performance

Darlly filters are engineered for exceptional water clarity and durability. With high-quality materials and efficient dirt capture, they maintain strong flow rates while standing up to regular cleaning and high pressure.

Known To Fit

  • Clarity Spas by Master Spas - Balance Range
Part Numbers
Pleatco Ref PWW35L-M
Unicel Ref 4CH-935
Other Ref 817-4035
Attributes
Filter Diameter (Range) 120-129 mm
Filter Diameter 127 mm
Filter Length 216 mm
Filter Top Handle
Filter Bottom Female Thread - SAE Course
Thread OD 48 mm
Filtration Area 35 sq.ft
Extra Information
Suitable For Waterway Plastics
More Info

Maintaining Your Filter Cartridge

With proper care, a filter cartridge can last up to 12 months. Follow these steps:

  • Check your spa manual for removal instructions.
  • Clean every two weeks using a hose or cartridge cleaning tool.
  • Soak in a non-foaming degreaser (e.g., dishwasher detergent or a proprietary cleaner) for at least an hour, preferably overnight. A cleaning powder like Pure-Spa Powder Filter Cleaner is recommended.
  • Rinse thoroughly before refitting and allow to dry if possible.

Rotation Method

For optimal performance, we recommend rotating two cartridges: one in use and one on standby. While one is in service, soak the other in detergent for 2448 hours to remove residues, then let it dry fully before reuse. A dry filter performs better when refitted.

Will a similar-looking filter fit my hot tub?

Sometimes, a filter thats 510mm bigger in height or diameter will still fit, and many people use alternatives if their original is hard to find or discontinued.

Key considerations:

  • Top of the filter: If your current filter has a closed top, you cant use one with an open top, as water will bypass the cartridge.
  • Bottom thread: Must match exactly.
  • Surface area: If the square footage is within 1015% of your original and it fits, its unlikely to cause issues.

Using a filter too far out of spec can restrict water flow, strain your pump, and potentially damage your hot tub. Always double-check before swapping.

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