{"product_id":"water-filter-cartridge-melt-blown-sediment-4-5x20-5-micron","title":"Melt Blown Sediment Drinking Water Cartridge 5 Micron - 20\" x 4.5\" Big Blue - MB4520-5","description":"\u003c!-- HASP-WFC :: FC-MB4520-5 :: rev WFC-2.0 :: begin --\u003e\n\u003ch3\u003eMelt Blown Sediment Drinking Water Cartridge — 5 Micron — 20\" x 4.5\" Big Blue\u003c\/h3\u003e\n\u003cp\u003eA 5 micron melt blown sediment drinking water cartridge in the 20\" x 4.5\" Big Blue size — 508mm long, 114mm outside diameter. Model \u003cstrong\u003eMB4520-5\u003c\/strong\u003e, HASP part number \u003cstrong\u003eFC-MB4520-5\u003c\/strong\u003e. It drops straight into any housing built for a standard 4½\" x 20\" cartridge.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eWe keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eShipped from VIC, NSW, QLD and WA\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePrice is for one cartridge.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e508mm (nominal 20\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutside diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e114mm (nominal 4.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTrade size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20\" x 4.5\" Big Blue (also written 4½\" x 20\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMelt Blown Sediment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMicron rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 micron nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnd style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOpen double ended (DOE), no gaskets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMB4520-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eCartridge 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSystems this suits\u003c\/h3\u003e\n\u003cp\u003eThese are industry-standard 4½\" x 20\" cartridges. They fit any housing built to that\nsize, regardless of who badged it. Known-good systems include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePuretec\u003c\/strong\u003e — WH Series whole-house mains (WH1-30, WH1-60, WH2-30, WH2-55, WH2-60),\nEcotrol EM Series rainwater (EM1, EM2-65, EM2-75, EM2-80), Hybrid-E rainwater and UV systems (Hybrid-E6,\nHybrid-E7, Hybrid-E7AMC, Hybrid-E13), FilterWall F Series. Puretec call the 4.5 inch format \u003cstrong\u003eMaxiPlus\u003c\/strong\u003e, so a MaxiPlus 20 housing takes this cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePentair \/ Pentek\u003c\/strong\u003e — Big Blue 20 inch housings, 3\/4 inch and 1 inch FNPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneric and house-brand housings\u003c\/strong\u003e — clear or blue sump, screw-off canister with a\npressure-relief button on the cap. Single, twin and triple manifolds, caravan and RV point-of-entry filters,\ntank pre-filters ahead of a UV steriliser, and RO pre-filter stages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhat it will not fit.\u003c\/strong\u003e Puretec \u003cstrong\u003eZ Series\u003c\/strong\u003e systems take Quick Twist\ncartridges — a sealed encapsulated format, not a loose cartridge in a sump, so nothing on this page\nsuits them. Nor do inline push-fit cartridges (Puretec IL series and similar). And if your housing seals the\ncartridge on a central 222 or 226 O-ring stem, or on a knife edge, it takes a different cartridge type\nentirely. Open the sump and look before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest suited to:\u003c\/strong\u003e Rainwater tanks, bores, dams and mains water. This is the standard first-stage sediment cartridge — the one that protects everything downstream of it, including UV steriliser quartz sleeves, carbon cartridges, RO membranes, solenoids and tap cartridges.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCross-reference — alternative part numbers\u003c\/h3\u003e\n\u003cp\u003eSame size, same media, same duty. Match on \u003cstrong\u003esize first, micron second\u003c\/strong\u003e — micron ratings are nominal and each manufacturer measures them slightly differently.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eEquivalent part number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eHASP\u003c\/strong\u003e (this listing)\u003c\/td\u003e\n\u003ctd\u003eFC-MB4520-5 — model MB4520-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003ePuretec\u003c\/strong\u003e PX Series (polyspun graded-density sediment)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePX05MP2\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003ePentek \/ Pentair \u003cstrong\u003eP Series\u003c\/strong\u003e spun polypropylene in the 2.5 inch sizes, and the \u003cstrong\u003eDGD\u003c\/strong\u003e and \u003cstrong\u003eGD\u003c\/strong\u003e dual-gradient cartridges in Big Blue (DGD-2501-20, DGD-5005-20 \/ 155358-43, DGD-7525-20 \/ 155356-43, GD-5010-20BB \/ 555469-43, GD-7520-20BB \/ 555470-43). Note the DGD and GD cartridges are dual-rated (a coarse outer wrap over a finer core), so they are equivalent in duty and fit but not in single micron rating.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eThe Two-Number Housing Rule (rev. TNH-1.0)\u003c\/h3\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eShut the isolating tap, press the pressure-relief button on the housing cap, then unscrew the sump.\u003c\/li\u003e\n\u003cli\u003ePull the old cartridge out and measure it \u003cstrong\u003eend to end\u003c\/strong\u003e. Roughly \u003cstrong\u003e248mm\u003c\/strong\u003e is a 10 inch. Roughly \u003cstrong\u003e508mm\u003c\/strong\u003e is a 20 inch.\u003c\/li\u003e\n\u003cli\u003eMeasure the \u003cstrong\u003eoutside diameter\u003c\/strong\u003e across the end cap. \u003cstrong\u003e63–70mm\u003c\/strong\u003e is a slimline (nominal 2.5 inch). \u003cstrong\u003e114mm\u003c\/strong\u003e is a Big Blue (nominal 4.5 inch).\u003c\/li\u003e\n\u003cli\u003eThose two numbers name the cartridge. This one is \u003cstrong\u003e20\" x 4.5\" Big Blue\u003c\/strong\u003e — 508mm long, 114mm outside diameter.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eWorked example.\u003c\/strong\u003e A Big Blue housing on the fill manifold for a WWDG swim spa at Officer, VIC. Through the blue sump it looks like a tall slimline. The vernier across the end cap reads 113.6mm and the tape reads 507mm, so it is 20 inch x 4.5 inch — a Big Blue 20. A slimline cartridge dropped into that housing leaves a 25mm annular gap all the way around and filters almost nothing.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eIf yours measures something else\u003c\/h3\u003e\n\u003cp\u003eSame media, same 5 micron rating, in all four housing sizes:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIf the old cartridge measures\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003ePart\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e248mm long x 63–70mm dia\u003c\/td\u003e\n\u003ctd\u003e10\" x 2.5\" Slimline\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-2-5x10-5-micron\"\u003eMB2510-5 — $7\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e508mm long x 63–70mm dia\u003c\/td\u003e\n\u003ctd\u003e20\" x 2.5\" Slimline\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-2-5x20-5-micron\"\u003eMB2520-5 — $17\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e248mm long x 114mm dia\u003c\/td\u003e\n\u003ctd\u003e10\" x 4.5\" Big Blue\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-4-5x10-5-micron\"\u003eMB4510-5 — $37\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e508mm long x 114mm dia\u003c\/td\u003e\n\u003ctd\u003e20\" x 4.5\" Big Blue\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis listing\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eChoosing the micron rating\u003c\/h3\u003e\n\u003cp\u003eThe general-purpose rating. Mains water and reasonably clean tank water.\u003c\/p\u003e\n\u003cp\u003eOther ratings in this cartridge, same 20\" x 4.5\" Big Blue size:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-4-5x20-1-micron\"\u003e1 micron — MB4520-1\u003c\/a\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 micron — this listing.\u003c\/strong\u003e The general-purpose rating. Mains water and reasonably clean tank water.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-4-5x20-20-micron\"\u003e20 micron — MB4520-20\u003c\/a\u003e — Visible grit and sand. A good first stage on tank or bore water.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-4-5x20-50-micron\"\u003e50 micron — MB4520-50\u003c\/a\u003e — Coarse pre-filter. Its job is to protect a finer cartridge downstream on dirty bore or dam water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLower 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhat melt blown sediment media does\u003c\/h3\u003e\n\u003cp\u003eSpun polypropylene depth media, graded so the outer layers catch coarse particles and the core catches the fine ones. The cheapest way to get sediment out of a water line.\u003c\/p\u003e\n\u003ch3\u003eWhat it will not do\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIt does nothing for chlorine, taste or odour. For that, use a carbon block cartridge in the same housing — \u003ca href=\"\/products\/water-filter-cartridge-carbon-block-4-5x20-10-micron\"\u003eCB4520-10\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eIt is not washable. Once it loads up it gets replaced — rinsing a melt blown cartridge just drives the trapped silt deeper into the core.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll four media in this range share the same 20\" x 4.5\" Big Blue housing, so you can change what a housing does just by changing the cartridge in it: \u003ca href=\"\/products\/water-filter-cartridge-melt-blown-sediment-4-5x20-5-micron\"\u003emelt blown sediment\u003c\/a\u003e, \u003ca href=\"\/products\/water-filter-cartridge-pleated-sediment-4-5x20-5-micron\"\u003epleated sediment\u003c\/a\u003e, \u003ca href=\"\/products\/water-filter-cartridge-carbon-block-4-5x20-10-micron\"\u003ecarbon block\u003c\/a\u003e or \u003ca href=\"\/products\/water-filter-cartridge-pleated-carbon-4-5x20-10-micron\"\u003epleated carbon\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy a spa parts company stocks drinking water cartridges\u003c\/h3\u003e\n\u003cp\u003eFill 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.\u003c\/p\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003cp\u003eThese 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 \u003ca href=\"\/collections\/cartridge-filters-complete\"\u003epool and spa cartridge filters\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhen to replace it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn pressure, not on looks.\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix months\u003c\/strong\u003e is the usual outside limit on mains water, and considerably less on tank, bore or dam water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrite the date on the housing\u003c\/strong\u003e in permanent marker when you fit it. Everyone believes they will remember. Nobody does.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eAlso sold as \/ common search terms\u003c\/h3\u003e\n\u003cp\u003eFC-MB4520-5, model MB4520-5, Puretec PX05MP2 equivalent, polyspun, spun poly, depth sediment. Also searched as 20 inch x 4.5 inch drinking water cartridge, big blue water filter cartridge, 20 inch water filter, whole house water filter cartridge, under sink drinking water cartridge, melt blown sediment cartridge 5 micron, big blue replacement cartridge.\u003c\/p\u003e\n\u003c!-- HASP-WFC :: FC-MB4520-5 :: rev WFC-2.0 :: end --\u003e","brand":"HASP","offers":[{"title":"Default Title","offer_id":47833060540605,"sku":"FC-MB4520-5","price":68.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/melt-blown-sediment-drinking-water-cartridge-5-micron-20-x-4-big-blue-mb4520-filter-cartridges-899.webp?v=1785375690","url":"https:\/\/heaterandspaparts.com.au\/products\/water-filter-cartridge-melt-blown-sediment-4-5x20-5-micron","provider":"Heater and Spa Parts","version":"1.0","type":"link"}