Spa & Hot Tub Filter O250

Pleated cartridge filter compatible with Inflatable Spa, MSpa and most plug-and-play hot tubs. 8.5 m² of filter media catches sweat, oil and fine debris; rinse weekly, replace every 4-6 weeks.

• Catches sweat, oil and fine debris from hot tub water.
• Compatible with Inflatable Spa, MSpa and most plug-and-play hot tubs.
• 8.5 m² of pleated polyester media for high flow.
• Rinses clean weekly with garden hose.
• Lasts 4-6 weeks of regular use before replacement.

Price

£26.34

When you need it

• Existing cartridge has yellowed or pleats are matted closed.
• Filter pressure is high or flow rate has dropped.
• Water is cloudy despite balanced chemistry.
• Filter is over 6 weeks old in regular use.
• Pre-emptive replacement before guests arrive.

How to use

1. Switch off pump and isolate power before opening filter housing.
2. Lift out old cartridge; rinse housing.
3. Insert new cartridge; ensure O-ring seal seats correctly.
4. Close housing; restart pump; check for leaks.
5. Rinse cartridge weekly with garden hose, top to bottom between pleats.
6. Soak monthly with Filter Cartridge Cleaner; replace cartridge every 4-6 weeks.

Dosing guide

Standard replacement every 4-6 weeks of regular use. Heavy bather use shortens to 3-4 weeks. Always rinse weekly between full changes; rinse alone does not extend life past 6 weeks.

• For Domestic 1500 L tub, regular use, add 1 cartridge every 4-6 weeks to reach Standard replacement.
• For Domestic 1500 L tub, heavy use, add 1 cartridge every 3-4 weeks to reach Shortened replacement.
• For Holiday let tub, add 1 cartridge per turnaround to reach Per booking changeover.
• For Annual stock, add 8-12 cartridges to reach 12 month supply.
• For Spare cartridge, add Keep 1 spare for monthly soak swap to reach Soak rotation.

How it works

Pleated polyester filter cartridge with O250 dimensions (203 mm tall, 134 mm wide, central thread mount), compatible with Inflatable Spa, MSpa and similar plug-and-play hot tubs.

Water passes through pleated polyester media, leaving particles 25 micron and larger trapped in the pleats. The high pleat count gives 8.5 m² of effective filter area, enough for 1500 L of hot tub water at typical pump flow.

Hot tub water carries 50 times the body load per litre of a swimming pool. Without effective filtration, oils and sweat overwhelm sanitiser within days. A clean cartridge is the single biggest factor in hot tub water clarity.

Frequently asked questions

Will it fit my hot tub?

Yes if your tub uses an O250 spec cartridge. Most Inflatable Spa, MSpa and plug-and-play tubs do; check existing cartridge dimensions to confirm.

How often do I replace?

Every 4-6 weeks of regular use; sooner under heavy bather load or holiday let turnover.

Can I rinse to extend life?

Yes, weekly rinse keeps the cartridge usable through the 4-6 week cycle. Rinse alone will not extend past 6 weeks.

Pack sizes?

Single cartridge or 6-pack (~6 month supply for a regular use tub).

Generic or brand-specific?

O250 spec is industry standard; works across all compatible tubs regardless of brand.

How do I clean it between changes?

Rinse weekly with garden hose. Once a month soak in Filter Cartridge Cleaner overnight.

What is the media?

Pleated polyester non-woven, 25 micron rating, 8.5 m² area, integrated polypropylene end caps.

Why O250 spec?

Industry-standard hot tub cartridge spec; defined by 203 mm length, 134 mm diameter, threaded centre mount.

Can I bleach it to extend life?

No. Bleach degrades polyester pleats and shortens life. Use only Filter Cartridge Cleaner or equivalent.

Cloudy water with new cartridge?

Sanitiser too low or shock needed; not filter problem.

O-ring leak?

Replace and lubricate before refit.

Polyester vs paper cartridge?

Polyester pleats wash and last longer; paper is single-use. Polyester is the modern hot tub standard.