Large Volume Water Changes in RDWC

jcommerce

Well-Known Member
Just looking for insight and experiences in large volume water changes for my upcoming rig ( https://www.rollitup.org/grow-room-design-setup/515830-8000k-20-x-20-x.html ). It will have 24 x 14 gallon totes plus 50 gallon rez. The totes will be about 70% full, or 10 gallons and the rez will be about 50% full or 25 gallons....so approx 265 gallon volume. I have a 300 gallon R/O water storage tank that will always be at the ready, but I'm not looking forward to water changes. I've run a 12 bucket RDWC with 70 gallon volume through veg and flower with only a partial (40%) water change during the 10 - 12 weeks, and it has been very successful...then full R/O and Clearex flush...but that's 70 gallons. Doing a 265 gallon change will be another story. My rig will have a quick drain system, then I'll be able to pump the fresh R/O in with a sump and hose...but I foresee it being a pretty big project. I'd prefer to do this only when I do my final flush. I plan on doing a Clearex rinse (medium) and dip (roots) when I transition from Veg to Flower, but they'll be coming from the Veg room to the Flower room when I do this..when they're still relatively small and mobile. Doing multiple, full system water changes sounds lame.
 
Are you going to run a water chiller? Have you considered switching to coolers to keep the water from heating up? Do you like kittens? What nutes are you running?

I like the idea of running some sort of sump pump or a pump that can go both ways for getting rid of waste water. You might get away with just changing out the res a couple times if you don't have root rot or any uckies like that...
 
Yes, will be running a 1/2 HP chiller rated for 320 gallons. What do you mean by coolers? I'm a dog person. Botanicare (including Aqua Shield)
 
You gotta do what you gotta do. If you don't want to put in the effort then don't do it, suck it up, YES it will take a long time, YES you socks will get wet, YES you will use a ton of nutes, YES your R/O filter takes that long to refill. BUT you have 8k in lights so about 20lb every 9 weeks? FUCK YEAH its worth it
 
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