Size. Big Blue filter housings work best with point-of-entry flow rates for a whole house. Smaller filters and filter housings are used at the point-of-use (POU). The small cartridges are designed to install under the sink to filter water to a dedicated faucet or with a combination of filters in a reverse osmosis system. Filter housings are designed differently to accommodate flow rate. If you're looking for a point-of-entry (POE) filter, you'll want something that can withstand high flow rate. And that's where the Big Blue housings come into play.
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