i had a sm161 for about 6 months now and the pump recently stopped working correctly. it isnt making any microbubbles and has given me a mild shock. When it did work, it worked pretty good after it was set. setting it was a little more difficult than it should be, but to be honest i heard they were finicky before i bought it so i cant really make that complaint. I never got mine from aquacave, but instead from a canadian online store called petsandponds.com. Hopefully they send me a reply to my email pretty soon with an explanation and a fix for my skimmer.
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