How Much
Chemical?

FORMULA

HMC = A x ( B1 ÷ B2 ) x (C1 ÷ C2)

HMC

= How much chemical

A

= Amount of chemical from the CPO Durham handout or book 

B1

= the size of your pool

B2

= 40,000 L.

C1

= Your desired changed

C2

= The amount of change in ppm in 40,000 L. 

EXAMPLE

Your pool is 585,900 L.
Raise your Calcium Hardness level 200 mg/L using Calcium Chloride (100%)

HMC = A x ( B1 ÷ B2 ) x (C1 ÷ C2)

HMC = 402 grams x ( 585,900 ÷ 40,000 ) x (200 ÷ 10)

HMC = 402 grams. x 14.6 x 20

HMC = 117,384 grams ÷ 1000

HMC =  117.384 kg or 117.4 kg.