Flood and drain timer questions
I have just about finished my flood and drain Aquaponics set up but am at a hurdle with finding a timer that does what I want. I have 4 bath tubs and an indexing valve that cycles through each tub. And bell syphon to drain each one. I have a large pump because a large flow rate was needed to drive the cam on the indexing valve. The problem I have is the standard timers only have 15 minute increments. But as the pump flows faster than the drain can take it away it overflows after around 6 minutes. So I need a digital timer that I can set in minute increments for all 4 baths and just keeps repeating.
I bought an HPM digital timer but astonishingly I can't just set it to repeat the 8 on off cycles. I thought this would be a standard feature on a digital timer.
Does anyone have a timer to recommend or advice please?