APEC PHPLUSKIT-14 US MADE 10" Alkaline High Purity pH+ Calcium Carbonate Inline Filter Kit with 1/4" Quick Connect Increase ph level of the water by adding calcium carbonate mineral back into the water Made of 100% us-made high purity calcium carbonate to effectively neutralized acidity Friction-welded construction with no glues or binder to provide reliable, no-leak seal Quick connection fittings for easy leak free installation A perfect add on filter to compliment any existing or new ro drinking water systems