How many filter canisters do 350 GPM filters have?

• A. 12
• B. 15
• C. 18
• D. 20

Answer: (C)

The number of filter canisters is set by how much filtration surface area the system needs to handle the flow without letting the liquid pass through too quickly. More canisters provide more media surface, spreading the 350 GPM across a larger area so the fluid moves at a safe, effective velocity and the filters don’t clog or create excessive pressure drop.

In this configuration, 18 canisters are designed to deliver 350 GPM while keeping the differential pressure within the system’s limits. Fewer canisters would increase the velocity through each canister and raise the chance of inadequate filtration or faster clogging. More canisters beyond the design would add unnecessary weight, cost, and space requirements, without improving performance for this rating.