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#1
02-25-2009, 04:37 AM
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Cavitation and aeration are two different things. If the intake to your pump is blocked partially to fully cavitation will occur. If air is getting into your pump then airation is occurring. Im not sure if cavitation could cause microbubbles but checking the intake for restriction would be one to check on top of air leaks.
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#2
02-25-2009, 04:55 AM
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Thanks everybody I will check it out, just not tonight. If I touch anything this late Murphy's law will kick in... With well over 325g of water it could be ugly.
You guys are the best!!! 
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#4
02-25-2009, 05:40 AM
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A Blueline 100. Not happy with it. A killer on power bug time. Will be changing it.
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#5
02-25-2009, 05:41 AM
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It's pretty unlikely that you have something like a pinhole in the side of a pipe, you just don't have enough pressure to rupture PVC. If you have a hole it will be somewhere at the edge of a fitting where the glue has a space in it. This space could theoretically allow air to be sucked in by the movement of the water through the pipe like the venturi on your skimmer works.
In practice this is pretty unusual in a return line, the back pressure would be more likely to force water out of the hole than draw air in. Due to the rise in your system I imagine you have a check valve on there that will keep the pipe full with the pump shut down. Turn off the pump and look for leaks either in the plumbing or around the pump volute.
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