Auto Top-Off

[RayAllen]

Yikes, glad you caught it. When I installed my auto topoff I was able to keep a close eye on it for a couple of days and noticed that it was syphoning on its own. I quickly realized that if the tube was pointing down when the pump turned on that it would simply continue to syphon when the pump turned off because when it stopped air was not able to get into the tube. I simply ziptied the tube so that it pointed up and this made it so a air bubble shot up the tube and stopped the flow; I never had the syphon problem again. And my water level in the resivoir was higher than that of the sump with no problems at all.

[rocketeer]

I have my topoff system flowing through a float valve as a last resort safety. If everything else fails in an "on" mode, the sump fills another inch or two and the float valve closes.

Jack

[longhorna95]

I agree, you should never attempt to make any changes to your tank i you cannot be there for the next 24 hours to make sure a seal, zip tie etc. will stay in place and that your changes actually work.

[matt]

This is exactly what I like about my top off system, which is a dosing pump pushing water through a kalk reactor. There is literally no way the dosing pump can continuously add water like a float switch/powerhead arrangement. I do have to periodically adjust the output of the dosing pump to match seasonal changes in evaporation, but that's a small price to pay for never worrying about the system sticking on and flooding the sump.