Looking for ATO

My dual switch from autotopoff.com is working just five going on 5 years now.

This. I go with the low voltage option and run a masterflex standard peristaltic drive. I aim for about 50% duty on my top off pump. If you ever run kalkwasser or your floats fail or your relay gets stuck on then it will take a while to cause damage. This way you hopefully have time to correct the issue.
 
Looking for ATO

I've had two separate Tunze 3155's for 6-7 years. Both still work great and I've never had an issue other than having to replace the pump (I think I only replaced one). It was cheap to replace and I have two spare pumps on hand if I need them. I don't really have a desire to use anything else since the Tunze's have been some reliable.

EDIT: I also bought a used Tunze kalk dispenser cheap that works pretty well. It's a simple gizmo, not like a kalk stirrer, but it works well.
 
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