Alkalinity Adjustment
Calculator

Analyze your water's alkalinity and calculate how much chemical is needed to raise it to an optimal level. Proper alkalinity buffers pH and prevents corrosion of pipes and fixtures.

Your Water Chemistry

Current Alkalinity — from your water test (as CaCO₃)

mg/L

Target Alkalinity — ideal is 80–120 mg/L

mg/L

Current pH — if known

Treatment Method

Chemical to Use

Soda Ash (Na₂CO₃)

Most common for injection systems. Raises both pH and alkalinity.

Baking Soda (NaHCO₃)

Raises alkalinity with minimal pH change. Good for high-pH low-alk water.

Calcite (CaCO₃)

Neutralizer tank media. Slowly dissolves to add alkalinity. Passive — no pump.

Flow Rate — if using injection method

GPM

Household water use — about 75 gal per person per day

gal/day

Alkalinity Analysis

Current

—

mg/L

Target

—

mg/L

Increase Needed

—

mg/L

Alkalinity Level

04080120200+

—

What is alkalinity? Alkalinity is your water's ability to resist pH changes (buffering capacity). Water with low alkalinity has unstable pH that can swing dramatically. Even if your pH tests at 7.0, if alkalinity is below 40 mg/L, the pH can drop quickly when it contacts pipes, causing corrosion. The ideal range for residential well water is 80–120 mg/L as CaCO₃.

Alkalinity AdjustmentCalculator

Alkalinity Adjustment
Calculator