I tested the alkalinity of the water with test strips. It really increases the alkalinity compared to our unfiltered tap water. However, the top cap has a fancy lid that requires you to press down on a self-sealing lid to fill it with water. A little annoying, but not critical. Also, these are the cheapest "alkaline" replacement filters I've been able to find.
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
Filter under the sink Aquaphor Favorit ECO silver
20 Review
🔧 NANPU 1/2" NPT Compressed Air Filter Regulator Combo Piggyback with Auto Drain, 5 Micron Brass Element, Poly Bowl, Metal Bracket, and 0-150 psi Gauge
18 Review
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review