Pleated Sediment Drinking Water Cartridge 50 Micron - 10" x 4.5" Big Blue - P4510-50

Pleated Sediment Drinking Water Cartridge — 50 Micron — 10" x 4.5" Big Blue

A 50 micron pleated sediment drinking water cartridge in the 10" x 4.5" Big Blue size — 248mm long, 114mm outside diameter. Model P4510-50, HASP part number FC-P4510-50. It drops straight into any housing built for a standard 4½" x 9¾" cartridge.

• We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
• Shipped from VIC, NSW, QLD and WA

Price is for one cartridge.

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Dimensions

Length	248mm (nominal 10")
Outside diameter	114mm (nominal 4.5")
Trade size	10" x 4.5" Big Blue (also written 4½" x 9¾")
Media	Pleated Sediment
Micron rating	50 micron nominal
End style	Open double ended (DOE), no gaskets
Model	P4510-50

Cartridge lengths are nominal industry-wide. A 10 inch cartridge measures 248–254mm and a 20 inch measures 500–508mm; the housing spring takes up the difference. Diameter has no such slack — if the diameter is wrong, the cartridge is wrong.

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Systems this suits

These are industry-standard 4½" x 9¾" cartridges. They fit any housing built to that size, regardless of who badged it. Known-good systems include:

• Puretec — WH Series whole-house mains (WH1-30, WH1-60, WH2-30, WH2-55, WH2-60), Ecotrol EM Series rainwater (EM1, EM2-65, EM2-75, EM2-80), Hybrid-E rainwater and UV systems (Hybrid-E6, Hybrid-E7, Hybrid-E7AMC, Hybrid-E13), FilterWall F Series. Puretec call the 4.5 inch format MaxiPlus, so a MaxiPlus 10 housing takes this cartridge
• Pentair / Pentek — Big Blue 10 inch housings, 3/4 inch and 1 inch FNPT
• Generic and house-brand housings — clear or blue sump, screw-off canister with a pressure-relief button on the cap. Single, twin and triple manifolds, caravan and RV point-of-entry filters, tank pre-filters ahead of a UV steriliser, and RO pre-filter stages.

What it will not fit. Puretec Z Series systems take Quick Twist cartridges — a sealed encapsulated format, not a loose cartridge in a sump, so nothing on this page suits them. Nor do inline push-fit cartridges (Puretec IL series and similar). And if your housing seals the cartridge on a central 222 or 226 O-ring stem, or on a knife edge, it takes a different cartridge type entirely. Open the sump and look before ordering.

Best suited to: Rainwater and bore water where turbidity swings with the season, and any install where you want longer between changes. The pleats hold far more dirt than a spun cartridge of the same size and give up less pressure doing it, which matters on gravity-fed tank systems.

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Cross-reference — alternative part numbers

Same size, same media, same duty. Match on size first, micron second — micron ratings are nominal and each manufacturer measures them slightly differently.

Brand	Equivalent part number
HASP (this listing)	FC-P4510-50 — model P4510-50
Puretec PL Series (pleated washable sediment)	PL50MP1

Pentek / Pentair R Series and ECP Series pleated cartridges (ECP5-BB, ECP20-20BB / 255495-43). The ECP media is a cellulose-polyester blend rather than straight polyester, so it is a fit-and-duty equivalent rather than a like-for-like media match.

The same cartridge is sold under a long list of house brands and importer labels — Aquastream, Aqua Filter, Clarence, Filter Systems Australia, Waterpro, WECO, SpiroPure, Geekpure and others. If a competitor's part number is not listed here, give us the two measurements and the media type and we will tell you whether this is the same cartridge.

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The Two-Number Housing Rule (rev. TNH-1.0)

A drinking water cartridge is named by two numbers and only two: length and outside diameter. Get both right and it fits. The micron rating never changes the fit — that is a separate choice.

1. Shut the isolating tap, press the pressure-relief button on the housing cap, then unscrew the sump.
2. Pull the old cartridge out and measure it end to end. Roughly 248mm is a 10 inch. Roughly 508mm is a 20 inch.
3. Measure the outside diameter across the end cap. 63–70mm is a slimline (nominal 2.5 inch). 114mm is a Big Blue (nominal 4.5 inch).
4. Those two numbers name the cartridge. This one is 10" x 4.5" Big Blue — 248mm long, 114mm outside diameter.

Worked example. A rainwater line at Officer, VIC, feeding the house and a WWDG swim spa fill point. The cartridge is a squat blue drum, nothing like a slimline. The vernier across the end cap reads 113.6mm and the tape reads 250mm — 10 inch x 4.5 inch, a Big Blue 10. Drop a slimline cartridge into that housing and it sits in a 25mm annular gap all the way around, so most of the water walks straight past the media.

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If yours measures something else

Same media, same 50 micron rating, in all four housing sizes:

If the old cartridge measures	Size	Part
248mm long x 63–70mm dia	10" x 2.5" Slimline	P2510-50 — $18
508mm long x 63–70mm dia	20" x 2.5" Slimline	P2520-50 — $31
248mm long x 114mm dia	10" x 4.5" Big Blue	This listing
508mm long x 114mm dia	20" x 4.5" Big Blue	P4520-50 — $76

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Choosing the micron rating

Coarse pre-filter. Its job is to protect a finer cartridge downstream on dirty bore or dam water.

Other ratings in this cartridge, same 10" x 4.5" Big Blue size:

• 1 micron — P4510-1 — Fine silt and cyst-size particles. The usual choice as a final polish, or ahead of a UV steriliser that needs clear water to work.
• 5 micron — P4510-5 — The general-purpose rating. Mains water and reasonably clean tank water.
• 20 micron — P4510-20 — Visible grit and sand. A good first stage on tank or bore water.
• 50 micron — this listing. Coarse pre-filter. Its job is to protect a finer cartridge downstream on dirty bore or dam water.

Lower number means a finer filter, not a better one. A 1 micron cartridge on dirty bore water blocks in a fortnight; a 50 micron on clean mains water barely earns its keep. Where the water is genuinely dirty, run a coarse cartridge in the first housing and a fine one in the second.

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What pleated sediment media does

Pleated polyester media, folded to pack far more surface area into the same housing than a spun or wound cartridge of the same size.

What it will not do

• It does not touch chlorine, taste or odour. For that, use a carbon block cartridge in the same housing — CB4510-10.
• Pleats can be rinsed and re-used a few times, but they pack out eventually and stop recovering pressure. Treat washing as a way to stretch a cartridge, not to keep one forever.

All four media in this range share the same 10" x 4.5" Big Blue housing, so you can change what a housing does just by changing the cartridge in it: melt blown sediment, pleated sediment, carbon block or pleated carbon.

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Why a spa parts company stocks drinking water cartridges

Fill water is the one thing about a spa you get to choose completely, and it is the cheapest point in the whole system to fix. Sediment carried in on the fill hose scours pump seals and packs itself around a heater element, where it insulates the element and shortens its life. Chlorine and chloramine already present in mains water start consuming your sanitiser budget from the first fill and skew every test result you take in the opening week.

A cartridge on the fill line or the house main means a WWDG, SpaPro, Sapphire, Alpine or Vortex spa starts on water you have actually chosen, not whatever the street main happened to be carrying that morning. The same applies to pool top-up over summer, when a pool can take in more water in a fortnight than a spa holds outright.

These are plumbing-line drinking water cartridges, not spa or pool filter elements. If you are after the pleated element that sits inside a spa or pool filter body, that is a different part — see our pool and spa cartridge filters.

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When to replace it

• On pressure, not on looks. A sediment cartridge is finished when flow at the tap drops off, regardless of how clean the outside still appears. Surface discolouration is cosmetic; the loading that matters happens inside the media.
• Six months is the usual outside limit on mains water, and considerably less on tank, bore or dam water.
• Write the date on the housing in permanent marker when you fit it. Everyone believes they will remember. Nobody does.

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Also sold as / common search terms

FC-P4510-50, model P4510-50, Puretec PL50MP1 equivalent, pleated polyester, washable sediment cartridge. Also searched as 10 inch x 4.5 inch drinking water cartridge, big blue water filter cartridge, 10 inch water filter, whole house water filter cartridge, under sink drinking water cartridge, pleated sediment cartridge 50 micron, big blue replacement cartridge.