NOTES ON PREVENTING CORROSION, COMMON TYPES OF CORROSION, AND WATER QUALITY
PROPER CONNECTIONS AND GROUNDING
Properly ground the GARN® WHS unit to avoid electrolytic corros ion due to a “floating ground.” Refer to the ELECTRIC ISOLATION AND PROPER GROUNDING TO PREVENT ELECTROLYSIS CORROSION on page 78.
DO NOT install a copper, domestic water-heating coil within the tank as this may cause corrosion of the steel shell. Attach only non-galvanized, black steel pipe to the GARN® unit. Maintain 4’ to 6’ of non-galvanized , black steel pipe between the GARN® unit and any copper pipe. Install dielectric couplings where copper pipe connects to steel pipe. All piping should be flushed with the GARN® unit when the pre-clean is being done.
WATER POLLUTION FROM RURAL WELLS
Generally, GARN® equipment is filled with water from a local, rural well. The pH level and the amount of iron, hardness, suspended particulates, dissolved chemicals, organics, etc. vary greatly in “normal” water. During the past couple of decades, national surveys have shown a significant increase in the number of polluted rural wells. As a result, it has become obvious that corrosion is a complicated issue requiring professional attention and ongoing owner maintenance.
POLYPHOSPHATES AND GARN FILL WATER
DO NOT FILL YOU GARN UNIT WITH WATER THAT CONTAINS POLYPHOSPHATES. EARLY TANK FAILURE WILL OCCUR. Contact your local water department if you are filling your
unit with water from a central water system (not a personal well).
The well water in some areas may contain high levels of dissolved and/or suspended iron. A town’s public works department has two options in order to prevent iron damage and discoloration of household faucets, tubs, etc for their customers: • Remove the suspended iron by using a central treatment/filtration system before distribution. • Add Polyphosphate chemicals to “suspend” the iron so it simply passes thru the system without settling on or coating surfaces. In some circumstances, the town elects to use the polyphosphate additives to “suspend” the iron. Filling a GARN unit with water containing polyphosphates will lead to serious corrosion issues. When water containing polyphosphates is heated above approximately 140°F, the iron that is being held in suspension will settle out creating a thick layer of sludge on the bottom of the GARN unit. As a result, under deposit corrosion will rapidly develop and lead to early tank failure. If your GARN fill water is to be taken from a central water system (not a personal well), ALWAYS contact the local water department and ask how iron issues are mitigated. If polyphosphates or other “suspension agents” are used DO NOT use that fill water. Find another source of water.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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