Bubbles in Closed Loop

[plutoniumJoe]

Thanks for all the reply's it is nice to have the community for more than just a buy/sell board.

I will try the throttling back.

Originally Posted by sphelps

It's also possible that the intake plumbing has become more restricted resulting in a lower pressure at the pump intake, if the pressure is low enough it can actually liberate dissolved oxygen. To test for this just throttle back the pump output halfway, if the bubbles stop this is likely the issue. I've seen this happen with these pumps when people don't plumb large enough pipes and bulkheads. Untamed is also correct regarding cavitation which is essentially the same thing, a good cleaning could fix things.

If not it could also be the seal on the pump, anywhere you notice salt creep could be a potential leak.

and then work my way up from there. I really hope it is not a joint above the true union. I dreamt of Rubber Maids and total tank cleanouts last night.

** If I take apart the impeller do I need a new seal kit?

[intarsiabox]

Originally Posted by plutoniumJoe

** If I take apart the impeller do I need a new seal kit?

Carefully remove the impeller and take a look at both seal faces, if there are any scratches, chips or uneven wearing then you should replace the seal. If after you clean out the impeller the seal faces look good take a Q-tip soaked in a bit of rubbing alcohol and clean the seal faces before replacing the impeller. Even if all looked good the seal may still leak as they don't always mate up perfectly if they've been used for a while. You may be able to buy the mechanical seal at a pump rebuilding company for about $20 rather than ordering an actual reeflo seal if that is any easier for you.