I'm sure there was some loss albeit minor but this was the quick change weekly WC. For the monthly change, I would turn off the return pump which would fill the sump up to about 90% capacity, then I would remove the stand pipe and drain the whole sump leaving about 10%, the last of this water and dietris would be removed via shop vac. Last would be turning the pump in the basement filling the sump to the 90% mark again (marked on the side of the sump) and utilizing a float to kill the pump and turn the return pump back on...the skimmer and other equipment would then turn on 30min later...
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Glass box with stoney stuff and fisches...
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