Pool Calculators

All pools and spas need maintenance. We at Hines Pools & Spas are here to help you determine just what kind and amount of maintenance your pool or spa needs. Our handy calculator will take you step by step how to figure out amounts of chemicals needed to keep your pool or spa crystal clean. All you need are the dimensions of your pool and spa.

To determine the proper amount of chemicals to use for your pool, you will first need to calculate how much water it holds. Use these pool volume calculators to find the volume of your pool.

Calculate Volume

 

Width
Length
Shallow Depth
Deep Depth
Volume

Round Pool or Spa Volume Calculator

 

Diameter
Avg Depth
Volume

Volume and Test Kit Readings

Volume
pH
Free Chlorine
Total Chlorine
ppm
Total Alkalinity
Calcium Hardness
Shock Required
lbs of Cal Hypo 65%
Add Sodium Bicarb
Add Cal Chloride
Add Soda Ash

pool shells
Most pools are not perfect rectangles. Estimate volume by fitting the best rectangle that will cover your pool. Reduce or increase the volume calculated by 10-20% as appropriate to your pool.
pool measurement

Add only if Total Alkalinity is above 100 ppm.

Lowering or raising pH:

Maintaining proper Total Alkalinity helps maintain the correct pH. Always adjust TA before trying to adjust pH. If your TA level is too high, call us for advice on how to use acid to lower it. This can be a tricky procedure and is best left up to experienced professionals to achieve good results without damaging your plaster.

If pH is too high and alkalinity is correct:

use an acid demand test from your test kit to determine how much acid to add to your pool. If you don't have this test, you can add 2 cups of muriatic acid per 10,000 for every tenth of a point that you need to lower pH. This is approximate. Retest pH a few hours after adding acid. Always add acid to water - never water to acid.

 

Proper Chemical Levels

Free Chlorine: 1-3 ppm
Total Alkalinity: 100-120 ppm
Calcium Hardness: 200-250 ppm
pH Range: 7.2 - 7.6