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The HammerHead is an inline shower filter with a lead-free brass housing and a replaceable cartridge built around KDF 55 and calcium sulfite. It screws onto a standard half-inch shower arm and accepts any fixed, handheld or rain head. HammerHead argues media quality and surface area matter more than stage counts, and the housing is meant to be kept for years while only the cartridge is swapped. It suits households of five to seven people who want chlorine and heavy-metal reduction without losing shower pressure.
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Lowest price we've seen: $49.99 on Nov 11 at eBay. Tracked across 1 store since Nov 11.
Buyers rate it highly and most report cleaner-feeling water, with many noticing softer skin and hair within days. Complaints are few and center on cartridge upkeep and the added bulk on the shower arm.
This inline shower head filter reduces chlorine and heavy metals in shower water. It uses a proprietary blend of KDF 55 and calcium sulfite, and the media is sized to maximize surface area without lowering shower pressure. The filtration method is also listed as alkaline or calcite, coconut shell carbon and KDF, in a 9-stage design.
The housing is made of lead-free brass, so only the internal cartridge needs replacing. The cartridge body is ABS. The universal inline design connects to handheld, rain or fixed shower heads. Installation takes about 5 minutes and needs no plumber.
