The hose's won't actually be in the water in the DT, they'll be above it. I wasn't worried about a back siphon. I wonder if the additives in the lines may flow back down, causing air in the lines that could lead to lag time during a on/off cycle causing a weaker than anticipated delivery of supplement's. Or if the pumps keep enough pressure in the lines to keep them continuously primed? If I was to install the checks they would be just short of the point of delivery, again only because the Dt is approx 3' higher than the unit.
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01-07-2011, 02:01 AM
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