MAINTENANCE PROCEDURES TO MINIMIZE CORROSION POTENTIAL Water treatment chemicals are consumed in the process of providing corrosion protection. The bottom of the GARN unit should be visible through the full water depth in the tank. One of the major features of GARN is the manway access on the top of the tank. Its benefit is the ease with which the thermal storage tank can be inspected and repaired if necessary. 1. Examine the water in the GARN unit several times per year. If clarity changes, deposits or corrosion is noticed, take a water sample (and/or a deposit sample) and forward it to the water treatment company. Upon receipt of the test results, adjust the chemical concentration as advised by the water treatment company. 2. At the end of each heating season, “top the tank off”. Whenever additional water is added to the unit, utilize the water filter provided so that sediment is not carried into the system. Add water treatment chemicals (based upon the volume of water added). 3. Add the recommended biocide at the following times: whenever makeup water is added to the unit; a few days before the end of the heating season; and at the beginning and/or middle of the heating season. Dusty or dirty locations require more frequent biocide additions to minimize sludge build-up and under-deposit corrosion potential. 4. Draw two samples of the treated water per year and send them to the water treatment company for testing and analysis. Upon receipt of the test results, adjust the chemical concentration as advised by the water treatment company. 5. Approximately every 5 or 6 years drain your GARN unit and heating system. Check with local officials to ascertain the safety of draining the treated water onto the ground or into a city sewer system. Do not drain hot water (allow it to cool to 75 F or lower) or water recently treated with biocide (within the last 4 to 6 months). Do not drain the GARN water into a septic system (it will overload the system and possibly destroy it). Prevent animals from drinking the water; simply allow it to be absorbed by the soil. Before draining the unit, draw a treated water sample and set it aside (for testing if required). Flush the tank with clean water. Like the cooling system of a car, all chemical suppliers recommend a periodic flushing of the system. Hose down the entire inside of the tank. Flush out all sludge that has accumulated in the bottom of the tank. All dirt and sludge must be removed . Inspect the cleaned tank. This simple visual inspection is more informative than hundreds of lab tests. Look for and identify any type of corrosion. Save samples of any sludge and corrosion residuals. Forward the water sample, sludge sample and corrosion residual sample to the water treatment company. Upon receipt of the test results, adjust the chemical concentration as advised during refilling. If corrosion spots are found, clean the spots thoroughly by wire brushing and flush the areas with clean water. 6. Refill the GARN unit in compliance with Initial Water Treatment Procedures. Obtain a treated water sample from the manway access and forward it to the water treatment company for an initial chemical test. Use good sampling procedures when obtaining the sample. Upon receipt of the test results, adjust the chemical concentration as advised.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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