Is it bad etiquette to squat on someone's thread?
I would be interested in how long you can let water sit with skimmer and powerhead running, at least partially covered.
I have a curing set up with unsalted RO/DI water in two Rubbermaid bins 50 gallons each, one with ASM G2,heater and chiller, Ocean runner 3500 running 900 gph into the second empty bin with a pvc return waiting for live rock and salt to arrive. Low light, partially covered (tubes, skimmer top, wires prevent closure).
Am I brewing something? Seems like bottled water probably sits for a while.