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Dimension One Spas Filters

Dimension One hot tubs use one of four filters. Pull your filter, measure it and match it to the cards below — every brand and pack size is on its page. D1 used several different cartridges over the years, so match your filter by size and by the bottom — threaded or twist-lock.

Your Dimension One filter, by cartridge

Not sure? Measure the diameter across the end cap, the length end to end, and check the top and bottom — open, handle, threaded or slip fit. Or send a photo of your filter through the form below and we will confirm the fit.

Shop: All Hot Tub Filters | Ego3 Reusable Filters

Resources: Compare Filter Brands | Water Care

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✅ Not Sure It Fits? Verify Before Ordering

Hot tub filter fitment varies by spa brand, model, year, filter size, thread style and top/bottom style.

To confirm the correct replacement, send clear photos of:

  • The label or end cap of your current filter
  • Your spa serial number sticker
  • The filter well with the filter removed (so we can see the fitting)

EZ Hot Tub Parts confirms fitment before you order, so you do not pay return freight on a wrong filter.

Dimension One filter buying guide

40 sq ft outside thread — 4CH-940. 4-5/8″ across, 14-3/4″ long, handle top, 1-1/4″ SAE thread bottom. Fits Dimension One Spas UltraFlow models with the 4-5/8″ threaded top-load filter (D1 part AK-9009). Options: Pleatco.

75 sq ft outside thread — 7CH-975. 7″ across, 10-5/8″ long, handle top, 1-1/2″ SAE thread bottom. Fits Dimension One Spas models with the 75 sq ft top-load threaded filter (D1 part 1561-12). Options: Pleatco.

52 sq ft outside thread — 7CH-552. 7″ across, 10-1/2″ long, handle top, male pipe thread (MPT) bottom. Fits select Dimension One models that use the 52 sq ft outside thread cartridge. Options: ProAqua. Singles, 2 packs and 4 packs are available.

75 sq ft open bottom — C-7367. 7-1/8″ across, 10-1/2″ long, closed w/y stand-offs top, open twist lock bottom. Fits select Dimension One models that use the 75 sq ft open bottom cartridge. Options: ProAqua, Darlly. Singles, 2 packs and 4 packs are available.

Use the buttons on each filter page to switch brand or pack size.

Not sure which filter brand is right for you? Compare Hurricane, OEM Factory Direct, Pleatco, ProAqua, Darlly and Ego3.

Keep your filters working longer: High Pressure Filter Nozzle | Filter Cleaner | Water Care — and every order over $99 ships free, so a spare set plus cleaner usually rides along at no extra cost.

Dimension One filters: 40 sq ft Outside Thread (Pleatco) | 75 sq ft Outside Thread (Pleatco) | 52 sq ft Outside Thread (ProAqua) | 75 sq ft Open Bottom (ProAqua)

Dimension One filter questions

What filter does my Dimension One hot tub use?

Depending on the model, Dimension One hot tubs use the 40 sq ft outside thread (4CH-940), the 75 sq ft outside thread (7CH-975), the 52 sq ft outside thread (7CH-552) or the 75 sq ft open bottom (C-7367). Measure your old filter and match the size and the bottom style, or send us a photo.

How do I tell which filter I have?

Measure the diameter across the end cap and the length end to end, then look at the bottom: open, threaded (outside or inside) or slip fit. The filter specs on each product page list all four.

Is the PDO-UF40 the same as the 4CH-940?

Yes. Pleatco PDO-UF40 and Unicel 4CH-940 are the same 40 sq ft cartridge from two different makers; the cross-reference list on each product page shows the other equivalent numbers.

Is the PDO75P3 the same as the 7CH-975?

Yes. Pleatco PDO75P3 and Unicel 7CH-975 are the same 75 sq ft cartridge from two different makers; the cross-reference list on each product page shows the other equivalent numbers.

Is the PDO75-2000 the same as the C-7367?

Yes. Pleatco PDO75-2000 and Unicel C-7367 are the same 75 sq ft cartridge from two different makers; the cross-reference list on each product page shows the other equivalent numbers.

How often should I replace my Dimension One filter?

Every 12 months, with a rinse every 2–4 weeks and a monthly soak in filter cleaner. Keeping a second filter to rotate makes both last longer.

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