I've used these timer/wavemakers twice and they were awesome. I used them with hagen powerheads, 801s plus Pro4s and Rio 2500's I never had a powerhead not work with them. I would have used one again but I've read Seios don't do well with on/off cycles IE a timer and I really don't want to spend $200 on a Seio controller. For now things seem to be working with two 620's on 24/7 and an 820 that comes on when the Halide comes on.
Doug
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