How to clean sump

I'd fill it completely up with vinegar and water. Let it soak for about 3 days and then take an acrylic pad to clean it off.
 
Take it out, clean it with muriatic acid, rinse it well and reinstall. That would take less than 2 hours compared to using white vinegar.
 
@mike44 wrote:
Ok....what if he is currently using it??????? said:
Many assumptions could be made ... from the picture it appears he isn't ... if it were the other way around I would assume the other...
 
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