There are a variety of ways to have an auto-top-off system. Some are bulky but easy and some are compact but require more handiwork.
[Only the LFS also requires that you also be very rich. :wink:]
Your toilet tank has an excellent and reliable automatic shutoff valve, doesn't it? Get one of the valves with the floating cylinder that moves up and down the inlet pipe, and install it alongside your filter in a piece of larger pipe or small trash barrel with siphon into the filter.
All refrigerator ice-makers have a small float valve that sets the height of the ice in the maker, I think. Try to find a dead refrigerator with ice maker and take it apart to find the valve.
Here in the desert, we don't use regular Air Conditioning, because our humidity is down around 10-15%. We use what we call "Swamp Coolers" that are evaporation towers with a big blower. They all have small float valves that are easy to adapt to aquarium use. IDK if you will find them on line or not. They cost less than US$5. I once found several in a Thrift Store for $0.50 each!
Check out any source of horse supplies (several are on line) and look for a horse-trough fill valve. I used to use one for water changes when I had 150 containers to deal with. I could hang it on a tank and count on the float valve to keep the carpet dry when I forgot it.
If you are truly handy, all old auto carburetors had a good float valve that was small and might be adapted to an auto-fill system. Never tried it, tho.
HTH
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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