You can still get shell or debris into the sump regardless of running the bag filters. It's not that easy, but it's not 100% safe either. There's nothing else that could have caused the impeller to wear like that. Something had to of gotten inside the pump and wore it down, as there is nothing else in there that could have caused that at all.
The impeller assemblies are one unit. They are not made to come apart to have the heads replaced, or shafts replaced, etc. We are out of stock on the impellers right now but they are in transit. Price on the impeller is $199.
Thanks,
Jeremy
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