Hi Izzy
I wanted a surge but I didnt want the bubbles...nor the toilet flush noise.
However I cant take any credit for the design, I came across the idea whilst researching surges on a forum in Michigan. I have to credit the guy on there, cmpenney...maybe he is on here too?
You can see his videos on youtube
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These videos and his design were my inspiration...I hope he wont mind me posting them for you.
As regards to the ABV...here is an amazon link. This is the version I have and I paid about the same for it, but i got mine from ebay.
http://www.amazon.com/Hayward-EATB1200STE-Actuated-Union-Valve/dp/B003JJ941K
You are welcome to copy my float switch idea...it isnt really mine anyway. I contacted a UK company, reefloat, who specialise in aquarium control devices like ATO units and automatic water change units. Their expertise in float switches made them an easy choice to design the surge control for me. I knew what I wanted and how I wanted it to work but had no idea of how to go about it.
So as far as the surge goes, I am standing on the shoulders of giants and the credit should go to them. Heres hoping mine works as well as cmpenney's does.