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pH of 7 is neutral, coffee is around 4.  Your water should be 6 - 8.5.

Alkaline and Ionized Systems

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Filter
Crystal Quest Slimline Whole House Water Filter, Alkalizing (2-4 GPM | 1-2 people)
Crystal Quest Slimline Whole House Water Filter, Alkalizing (2-4 GPM | 1-2 people)
From $228.85
Sale
Crystal Quest Big Blue Whole House Water Filter, Alkalizing (4-6 GPM | 1-2 people)
Crystal Quest Big Blue Whole House Water Filter, Alkalizing (4-6 GPM | 1-2 people)
From $490.80 $687.12
Sale
Crystal Quest Acid Neutralizing Whole House Water Filter
Crystal Quest Acid Neutralizing Whole House Water Filter
From $1,118.75 $1,566.25
Sale
Crystal Quest Commercial Acid Neutralizing Water Filtration System
Crystal Quest Commercial Acid Neutralizing Water Filtration System
From $1,335.00 $1,869.00