Ampac Alkaline Water Filter 4″ x 20″

What This Filter Does

Reverse osmosis membranes strip nearly everything from water – including calcium, magnesium, and potassium that your body uses. The result is pure but slightly acidic water, typically sitting between pH 6.0 and 7.0. This 4″ x 20″ alkaline filter restores those minerals and raises pH to the 8.0-9.5 range before the water reaches your tap.

Media and How It Works

The cartridge contains a blend of calcite, coral calcium, magnesium oxide, and tourmaline mineral media. As water passes slowly through the bed, it dissolves trace amounts of each mineral into solution. Calcium and magnesium harden the water slightly, potassium rounds out the mineral profile, and the alkaline media neutralizes residual acidity. The result is noticeably cleaner-tasting water compared to flat, demineralized RO output.

Installation

Install inline on the RO output line, after the post-carbon polishing stage. If your system includes a UV disinfection unit, place this filter before the UV lamp – UV works best on water that has already been polished and pH-adjusted. The 4″ x 20″ housing fits commercial RO systems and larger whole-house setups that use big-blue or equivalent housings rather than standard 10″ cartridges.

Replacement Schedule

• Replace every 12-24 months under normal residential use
• Higher-flow commercial systems may need replacement closer to the 12-month mark
• Higher source water TDS accelerates media consumption – shorten the interval if your feed TDS exceeds 500 ppm
• A drop in pH or flat taste are the practical signs the media is spent

Specifications

• Size: 4″ diameter x 20″ length
• Output pH range: 8.0 – 9.5
• Minerals added: calcium, magnesium, potassium
• Compatible with: RO post-treatment, commercial water treatment systems