What type of pumps are available which you could use on a closed poop and vary the speed with using the Neptune? I want more control then just on and off. I've never had anything but power heads I could vary the speed with.
:-( I saw one thread which involved taking apart two $200 pumps, merging their parts together, add some cheap electronics and then doing some electrical work, but it didn't appear to be an easy warranty safe DIYS project.
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