Yip agree with Kanga. A nice strong vinegar mix should help.Place the pump and return from chiller in a bucket. Then when finished remove vinegar water and use RO for a while. It is almost impossible to get all the water out the chamber so rather RO water than vinegar.
Yep, vinegar is rather acidic so it will shift all the deposits, but don't pump it through, pour in the vinegar and let it soak for a bit before running fresh water through - worked very well for my skimmer.
I would think whatever you use the flow direction while cleaning must be opposite to the normal operating direction. That should be able to get rid of stuff trapped that was too big to flow through.
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