How much tap water to cut with ro?

  • Thread starter ThatRapperWeed
  • Start date
  • Tagged users None
ThatRapperWeed

ThatRapperWeed

471
63
Hi all. I've been reading recently about RO water having trouble maintaining ph over time when mixed with nutes due to lack of minerals as a buffer. Since I'm about to be auto feeding, I want to avoid this. Would a good ratio of tap to ro water be 20%? So in my 10 gallon mix I have 2 gallons of tap water that's had the chlorine evaporated off? What do you guys think of this? I also wouldn't mind having more available calcium and magnesium for my coco.
 
BluePowerRanger

BluePowerRanger

151
43
I use advance nutrients in 50 gallon reses I’ve never had major ph fluctuations.. 100% RO water.. I can go 2 weeks without adjusting my ph and even then it’s only 6.1-6.3 range.. I start at about 5.7 on average..
 
ThatRapperWeed

ThatRapperWeed

471
63
I use advance nutrients in 50 gallon reses I’ve never had major ph fluctuations.. 100% RO water.. I can go 2 weeks without adjusting my ph and even then it’s only 6.1-6.3 range.. I start at about 5.7 on average..
Ok that's what I use. Maybe I won't worry about it as much, hand fed my last grow so I was mixing every day or two depending on how much I had left over.
 
Pondracer

Pondracer

391
93
Dont worry about it. I use full DI and once I figured out how to mix correctly the swings were greatly reduced. A day or two isnt a big deal at all. My reservoir goes 12-14 days or more, thats when its a headache.
 
ThatRapperWeed

ThatRapperWeed

471
63
Thanks for the responses. What are your thoughts on doing that with the water regardless? My thoughts are if I can reduce how much RO water I use, I make a small savings on my grow from start to finish and I'll have some more naturally available calcium and magnesium. Or is it not a good idea in general?
 
Pondracer

Pondracer

391
93
Thanks for the responses. What are your thoughts on doing that with the water regardless? My thoughts are if I can reduce how much RO water I use, I make a small savings on my grow from start to finish and I'll have some more naturally available calcium and magnesium. Or is it not a good idea in general?
Sorry for the late reply. I totally think you can, or even just bypass RO all together if you are just using it to lower initial PPM. If there is a problem that you are correcting with RO then that would be different but it doesnt sound like thats why you use it. I did it because I use RO for drinking and I wanted DI for a salt water aquarium. I like having a real flat, consistent baseline when mixing the tank. Honestly the PH swing surprised me because I wasn't getting it when mixing for 3 days supply. When it got out there to 12-14 day (65g) I started to get swings and even within the first 3 days that before seemed fine. Then I started being more careful how I mixed initially and trying to minimize the amount of PH Up or Down that I was using. I really don't know that going to tap water would solve that problem. Practice more than anything probably does the most to minimize that issue. That and the money for a dosing pump :)
 
Top Bottom