Hydrominder Anti-Syphon

[wrightwash]

I have a Hydrominder 506 on my soap tank. I've replaced the foot valve twice in the last two months, and both times I have walked into my soap chemical tank overflowing with water. I have heard of people adding an anti-siphon hole in the outlet tube on the hydrominder in case the foot valve fails. Where is this supposed to be positioned and how big of a hole?

I've been running the following foot valve: https://www.kleen-ritecorp.com/p-60...e-foot-valve-for-harsh-chemicals-10-pack.aspx

 

[edredtop]

Drilling a 1/8" hole below the eductor and above the waterline has worked for me in the past. Doing this can make it "spit" out of your drilled hole when it starts, so keep the hole below the top of your container as well.
The 512 comes with a siphon breaker.