Our Large Diameter Water Filter Housings are designed to provide reliable and durable enclosures for various types of filtration cartridges, ensuring the efficient operation of your water filtration system where high flows are required. Sometimes referred to as Big Blue, these housings use a 4.5" Diameter filter x 20in in length

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Frequently asked questions

Single holds one 20in large diameter cartridge; twin and triple hold two or three in sequence, letting you run multi-stage filtration (e.g. sediment then carbon) through one mounted unit.

1in BSP ports as standard across this range — check this matches your incoming pipework before ordering.

This is a colour/material variant rather than a performance difference — choose based on your preference or what matches your existing setup, unless the specific listing notes a functional difference.

Check the specific listing — SET options (like HF20BB-SET) include the bracket and spanner, while a housing-only listing means you'll need to order these separately.

20in large diameter (Big Blue) cartridges specifically — these won't fit a standard 10in or standard-diameter housing, so check your cartridge length and diameter match before ordering.