Soda Ash Dosing
Calculator

Calculate the metering pump injection rate for soda ash (sodium carbonate) to raise the pH of acidic well water. Soda ash is the most common chemical used to correct low-pH water that causes blue-green stains and copper pipe corrosion.

Well Pump Flow Rate

Flow Rate — your well pump's max output

GPM

Please enter a flow rate greater than 0

Water pH

Current pH — from your water test

Please enter your current pH

Target pH — typically 7.0–7.5 for most applications

Alkalinity — if known (affects dosing; leave 0 if unknown)

mg/L

Household water use — about 75 gal per person per day

gal/day

Soda Ash Solution Strength

Solution Concentration — lbs of soda ash per gallon of water in your tank

CWS standard: 4 lb in 6 gal (about 80,000 ppm, 7.4% by weight). This is the J-PRO-38 guide start-up batch.

Recommended Pump Settings

Soda Ash Dose

—

ppm (mg/L)

Injection Rate

—

mL / minute

Gallons Per Day

—

GPD

J-PRO-38 pump setting

Output switch

—

Stroke

—

of 100

Solution Tank Usage

Important: This is a starting-point estimate. pH correction is highly dependent on alkalinity (buffering capacity). Low-alkalinity water requires less soda ash but is harder to stabilize. After installation, test pH at the farthest faucet and adjust the pump output until you achieve your target pH. It may take several adjustments to dial in the correct setting.

Typical Soda Ash Dosing Guide

Current pH	Target 7.0	Target 7.5	Notes
6.5	40–60 ppm	60–80 ppm	Mild correction
6.0	60–100 ppm	100–140 ppm	Moderate
5.5	100–160 ppm	150–200 ppm	Significant
5.0	150–250 ppm	200–300 ppm	Heavy correction
4.5	250–400 ppm	350–500 ppm	Very aggressive water

Values assume low to moderate alkalinity (0–100 mg/L). Higher alkalinity water requires less soda ash.

Soda Ash DosingCalculator

Solution Tank Usage

Soda Ash Dosing
Calculator