ph20 says it increases the alkalinity of the filtered water. Incidentally, the first two filters I tested were twice the price of a regular filter, and they did NOT change the pH AT ALL! No change, and it wasn't lye either. It has registered at level 6 several times. I used litmus paper and these strips with 3 color blocks on them. Everything came out at 6. I bought 9 filters which means I'm spending $135. The way the filters worked was no different than the standard Seychelles filters, otherwise I would say I lost $270. I don't know how to contact the seller for a refund.
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