run your lights when power is cheaper. here in ontario, 7pm is when electricity is its cheapest. thats when my lights come on. this also has two additional benefits. In winter i keep the house cooler when we are all sleeping so having the lights on at night keeps the tank warm. In the summer, its cooler in the evening so having the lights on then keeps over heating to a minimum. I am home at 6PM so i get to enjoy my tank right up until i go to sleep.
use your return pump to drive your reactors - you can usually upsize your pump one model and use less electricity than running 3-4 smaller dedicated reactor pumps. This is very dependent on your pump selection so take the time to do the math.
you can use your ro waste water to fill your washer but be-careful, leaving it unattended will ensure a flooded laundry room.
skimmers and return pumps run 24/7. spend some good money on quiet and efficient models. the more expensive stuff has a better resale value as well.
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