Single replacement Dimension One Spas filter (40 sq ft outside thread) — Pleatco
Fits Dimension One Spas UltraFlow models with the 4-5/8″ threaded top-load filter (D1 part AK-9009). Match the diameter, length, and top and bottom style below to the filter you are replacing — if the numbers match, it fits.
Genuine Pleatco Advanced spa cartridge: point-bonded filtration fabric with a high volume of fine fibers for better flow and more dirt-holding capacity, on Pleatco’s Free Flow core that lets water reach more of the fabric at lower operating pressure.
In stock — orders processed same day or next business day. These filters should last 6 months when used with a filter cleaner.
Not sure which filter brand is right for you? Compare hot tub filter brands here.
Did you know the number one reason for hot tub freeze damage is a dirty filter? Dirty filters also cause additional stress on the pump/motor and leads to premature failure.
Proper Filter Care System:
- Have 2 sets of filters
- Install clean filter
- Rinse dirty filter with high pressure nozzle
- Verify no debris left between pleats, before storing on shelf to dry
- Once a month soak filters in a filter cleaner solution
Filter Specs:
- Diameter – 4-5/8″
- Length – 14-3/4″
- Top: Handle
- Bottom: 1-1/4″ SAE thread
- SQFT: 40
What’s in the box: one Pleatco filter cartridge.
✅ Not Sure It Fits? Verify Before Ordering
Hot tub part compatibility can vary by spa brand, model, year, serial number, control system, and part revision.
To help us identify the correct replacement part, please send clear photos of:
- Your existing part label or sticker
- Your spa serial number sticker
- The equipment area or installation location (if accessible)
EZ Hot Tub Parts can help confirm fitment before you order and help reduce costly returns.
It fits Dimension One Spas UltraFlow models with the 4-5/8″ threaded top-load filter (D1 part AK-9009). Measure your old filter end to end and across the end cap — this cartridge is 4-5/8″ across and 14-3/4″ long with a handle top and 1-1/4″ sae thread bottom. If the numbers match, it fits. Not sure? Send a photo through the form above.
This cartridge cross-references to: Pleatco PDO-UF40 / PDO-UF40P2, Unicel 4CH-940, Filbur FC-0177, Dimension One AK-9009, Saratoga PSG40N.
Yes — we stock this Pleatco filter in Minnesota and ship orders the same or next business day. Orders over $99 ship free in the lower 48.
Yes — genuine Pleatco Advanced spa cartridge with point-bonded fabric and the Free Flow core, not an aftermarket copy.
Rinse it every 2–4 weeks, deep-clean it monthly with filter cleaner, and replace it every 12–24 months or sooner if the pleats are torn, flattened, or the end caps are cracked. Keeping a second set to rotate makes both sets last longer.
PDO-UF40 Pleatco PDO-UF40 / PDO-UF40P2 Unicel 4CH-940 Filbur FC-0177 Dimension One AK-9009 Saratoga PSG40N
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