The AstralPool XC75 takes the AstralPool XC75 cartridge element SP78021 as its cartridge; Australian sellers list it from A$83.00 as of 6 November 2026. Fitment confirmed against the manufacturer's compatibility list.
Your pool filter
AstralPool XC75
Pool filter
Confirmed against AstralPool's listConfirmed against AstralPool's own compatibility list
Not yours? Change
Takes the SP78021 cartridge
XC75 cartridge element SP78021 · check the code on your old part before ordering.
Your pool filter
Pool filter
Confirmed against AstralPool's listConfirmed against AstralPool's own compatibility list
Takes the SP78021
Cartridge · check the code on your old part.
Other AstralPool pool filters and their cartridges
The SP78021 fits the XC75 only. These AstralPool models take a different cartridge:
GenuineGenuine AstralPool
$150.00
Heater and Spa Parts · 6 NovLowest genuine · Heater and Spa Parts · checked 6 Nov
CompatibleCompatible option
$83.00
Heater and Spa Parts · 6 NovHeater and Spa Parts · checked 6 Nov
Check sellerCheck seller details
Genuine: made by AstralPool. Compatible: another brand.Genuine is made by AstralPool. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $83.00
Heater and Spa Parts. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 2 listings from 1 seller
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens Heater and Spa Parts in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when a cleaned element still reads 30–40 kPa above the new-filter pressure, or is damaged; AstralPool says to check once a year.
After replacing: No reset light. Note the gauge reading with a clean element; AstralPool says to clean it when the gauge rises 15–20 kPa.
How to change the cartridge in your AstralPool XC75
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Turn the pump off at the power point. Open the air bleed valve on the lid until the gauge reads zero, then close the valves on the suction and return lines.
- 2XC and ZXC: take off the drain cap at the base to empty the tank, then refit it.
- 3Unscrew the locking ring anticlockwise (XC and ZXC: hold up the release tab first). Lift the lid off with the ring and pull the cartridge straight out.
- 4Hose the cartridge with a garden hose and nozzle, working between the pleats before it dries. Do not use a pressure cleaner. Fit a new cartridge if it is torn or no longer comes clean.
- 5Seat the cartridge on the spigot in the base (ZX and ZCF: fit the top spigot into it too). Check the lid O-ring and use only non-petroleum lubricant.
- 6Screw the ring down clockwise until the safety catch clicks. Hand tight is enough. Open the valves, start the pump and bleed the air.
Every number this part goes by
- Retail name:
- 78021
- Retail name:
- SP78021
Sellers list any of these; they are the same part.
About your AstralPool XC75
AstralPool pool filter — XC pool and spa cartridge filter. Its cartridge is the XC75 cartridge element SP78021, part SP78021.
Where the model number is: The model is on the label on the filter tank or under the lid (Zodiac CS150, Hayward C150S). On an above-ground pump it is on the pump's label or the box (Intex model 604 or item 28604, Bestway 58383); on an inflatable spa, on the box or the pump unit's label (Lay-Z-Spa Miami, Intex SB-H20). If the label has worn off, measure the old cartridge's length and diameter.
Fits this AstralPool model
AstralPool1 model
Common questions
- Which cartridge fits the AstralPool XC75?
- The AstralPool XC75 takes the AstralPool XC75 cartridge element SP78021.
- Where can I buy the SP78021 in Australia?
- We track 1 Australian seller for the SP78021; the lowest listed price when we last checked was A$83.00 at Heater and Spa Parts. Prices are re-checked daily and dated on this page.
- How do I fit the SP78021 in an AstralPool XC75?
- 6 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A clogged cartridge slows the flow and the pump works harder, and a torn one lets dirt back into the water, so the pool or spa clouds.
- Is there anything to reset afterwards?
- No reset light. Note the gauge reading with a clean element; AstralPool says to clean it when the gauge rises 15–20 kPa.
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