Pool filter cartridge
AstralPool XC75 cartridge element SP78021
SP78021
Fits 1 model
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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
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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 SP78021 pool filter cartridge
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.
Will it fit your appliance?
Type your model number and we'll check it against the makers' lists.
Fits this AstralPool model
AstralPool1 model
Common questions
- What does the SP78021 fit?
- The AstralPool XC75 cartridge element SP78021 fits the AstralPool XC75.
- 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?
- 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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