Coates PHS SERIES 54 & 480V - Manual (Page 8)

Proper water balance is important to extending the life of your Coates
Heater. While pH control is critical, the control of alkalinity and calcium
hardness will protect against scaling and also help to prevent corrosion.
ACID ALKALINE
HEATER
CAN BE
DAMAGED
CORROSIVE
WATER
IDEAL
RANGE
ALKALINE
WATER
0 1 2 3 4 5 6 7 7.2-7.8 8 9 10 11 12 13 14
HEATER
CAN BE
DAMAGED
The correct level of sanitizer, pH, total alkalinity and calcium hardness will very, depending
on the type of pool (plaster, fiberglass or vinyl) and the chemical content of the fill water.
Water that is out of balance can damage your pool heater and void the warranty. This
heater is not for use in salt water pools.
PROTECTING YOUR COATES HEATER
WITH PROPER WATER CHEMISTRY
WATER CHEMISTRY
PLUMBING CONNECTIONS
Page 8