Just keep it and buy the Tunze Auto Top Off. It uses redundant sensors to ensure that it doesn't fill up your sump and overflow. Just ensure the tubing isn't submerged in the sump, otherwise as already mentioned, you could get a back siphon going.
Mine is great and haven't overflowed it once. Knock on wood.
And besides, I use an old salt bucket as my new fresh water reservoir, so it only holds about 5 gallons of water. And the sump for sure has at least 5 gallons of additional capacity, so there's no way to overflow the system, unless the drain on the tank gets plugged and the water pumped up to the tank overflows.
Good luck.
Cheers.
Also, PS. You shouldn't be using tap water in a salt tank. Some people do with success, but I'd be scared to. You really should be using RO or even RO/DI water.
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