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Dear fellow lazy reefers out there, lazy as I am, I have thought of this DIY auto WC System. Whole thingy shall cost $100 - $150 depending of where you got the equipment (two set ATO, one or two digital timer) from. The main objective of this auto water change system is to prevent my tank from KNS while I am away for two weeks ah. My aim is simple, archive an automated 3% water change daily (amounting to a regular 20% WC weekly). Of course the flow and ON OFF and be adjusted if you wish to do a continuous dripping/ draining system. Draft Sketches: Ideally how this kick off is: 1) Timer for drainage ON for one min 2) Water flow out of main tank 2.a) Sensor at draining container is to prevent overflow 3) Once water level in main tank/ sump drop, top up pump will start pumping new water into main tank/ sump 4) Once water level in main tank/ sump reaches the sensor, top up will stop 4.a) If KS, an optional digital timer can be use to time the topup ON OFF. *Flow rate for both Top up/ Drainage tube can be adjusted using valve. *Reason for not draining water directly to toilet is that my tank is not located in the toilet ah So what do your guys/ gals think ah?