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WATER CHEMISTRY
(Corrosive water voids all warranties)
For your health and the protection of your pool equipment, it is essential that your
water be chemically balanced. The following levels must be used as a guide for bal-
anced water.
Recommended Level(s) Fiberglass Pools Fiberglass Spas
Other Pool & Spa
Types
Water Temp. (Deg. F) 68 to 88 89 to 104 68 to 104
pH 7.3 to 7.4 7.3 to 7.4 7.6 to 7.8
Total Alkalinity (PPM) 120 to 150 120 to 150 80 to 120
Calcium Hardness (PPM) 200 to 300 150 to 200 200 to 400
Salt (PPM) 6000 MAXIMUM 6000 MAXIMUM 6000 MAXIMUM
Free Chlorine (PPM)* 2 to 3 2 to 3 2 to 3
Total Dissolved Solids
(PPM)
3000 MAXIMUM 3000 MAXIMUM 3000 MAXIMUM
* Free Chlorine MUST NOT EXCEED 5 PPM!
• Occasional chemical shock dosing of the pool or spa water should not damage the
heater providing the water is balanced.
• Automatic chemical dosing devices and salt chlorinators are usually more efficient
in heated water, unless controlled, they can lead to excessive chlorine level which
can damage your heater, and which is not covered under warranty.
• Further advice should be obtained from your pool or spa builder, accredited pool
shop, or chemical supplier for the correct levels for your water.
Rev. 17 reflects the following:
Changes to: General Specifications on page 5, Fig. 5 and Teflon tape caution on page 8, Fig. 6 on page 9, Water Pressure
Switch and UG information on page 11, Table C on page 12, Fig. 20 on page 14, Low Water Cutoff information on page 19,
wiring diagrams on pages 20, 21 and 23, pressure switch information on page 24, Warranty information on page 35
Additions: Water chemistry notes on page 2, Flow Switch description, Note, and Fig. 9 on page 10, Piping Configuration on
page 15
Deletions: Figs. 39 and 40 on page 30, Illustrated Parts Lists, now available separately (Catalog No. 9100.65 for 926-1826
and 9100.70 for 2100-4001)