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Bullfrog Simplicity™ Flat Filters for M Series (4 Pack) Type_Spa Jet this is exactly the kind this is exactly the kind of effortless maintenance that justified the system in the first place Measure the outside diameter of the threaded fitting on your old cartridge before you order Pro Tip: Think of Simplicity filters as "clean it if you want to but the design is forgiving either way — the one thing you don't want to do is run a dirty filter for too long
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