Intake location, water depth and height above bottom matter a lot.
I just replaced our filters after 3+ months of several days a week use. There was almost zero visible sediment. The intake is in deep water, more than 15', on the opposite side of the breakwater from docking and held off the bottom by a frame. Actually the intake is a submersible pump mounted on a stainless steel frame installed by Island Support Service.
Our prior system had the intake just off the docking side of the breakwater, in about 6' of water held about 1' off the bottom. Docking always kicked up sediment from the prop wash. After 3 months of use, the sediment filter was packed with sand and grit.
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