When you got into the gallon count portion of the electronics that is not in gallons. There is no way to get 1,000 gallons of water in 10 sec from home water lines. It is simply a count to tell the unit when to regen. Most likely it is 1 gallon per 999 count. Anyway, get the electronics to the gallon count mode. Have someone turn on each faucet one at a time and turn back off. If there is a count on each faucet, then the water is running through the unit. Put the unit into a backwash cycle. Bring the gallon count back up and if it shows water flow, (with no inside water running) then the unit is hooked up backwards. Post your results and if needed, additional info will posted.