I used Aqualifter pumps at one time. I wasn't able to find a timer that did seconds, but minutes was adequate (but not great) for my tank. I didn't find Aqualifters were consistent enough, it was very frustrating. As well, the alk supplement hardened the pump diaphragm making it gradually loose flow. Better to bite the bullet and get peristaltic pumps you'd spend that much on a Ca reactor anyway.
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