Auto Top Off Siphoning
 

I just set up my auto top off and it just creates a siphon. How do I easily stop this?

What type of system setup do you have?

If using a pump then a small hole in the hose above the water line before it comes out of reservior tank will break the siphon when the pump shuts off.

skeeter

I used skeeter's method until I changed my plumbing to use a bulkhead exiting the reservoir tank near the bottom. What I have now is 1/2 in PVC exiting the reservoir to the pump, then 1/2 in PVC up from the pump to a height above the top of the reservoir. Here I switch to 1.5 in PVC to get the water over to and back down to the sump. The larger pipe prevents a siphon from occurring.

Sweet thanks guys. I did it with the hole and it worked. Thank you!

Make sure the hose that goes to your tank for top off is above the water line. That would be what Im guessing is why your getting a syphon.

hose above waterline.

I was running into the same problem. using toms aqualifter. I tried hanging the aqualifter above the sump and reservoir and this solved my problem. FYI the hose going into the sump was above the water level but after the pump would turn off it would still drip constantly until my backup mechanical float would kink the hose.

You can ply around with levels, pipes or you can get 12V electric valve. Put it in parallel with your ATO pump and you can place your ATO tank anywhere you want.
I got mine from these guys http://www.stcvalve.com/Solenoid_Valve.htm

1/8" Direct Acting 2 Way Plastic Solenoid
Valve with Stainless Steel Actuator
(12VDC, DIN)