Switching to RO

JDMase

Well-Known Member
So im considering changing from tap water which is in the ppm range of 400, classes as "hard water" in my area, to RO water. It's only .25p a litre and I know in Rockwool it might be beneficial to do so.

Is this ok to do halfway through a grow? Are there any issues/challenges I might encounter?

Also, I have cal/mag and wondered at what rate of PPM's should I add it. Do I add 400ppm cal mag and continue with my normal nute regimen?

Im using floranova grow and bloom at the moment. Thanks for the help in advance.
 

friedguy

Well-Known Member
Fine to do halfway through the grow... but I wouldn't keep the ppm levels as the nutes will be roughly 400ppm stronger. RO may require additional calcium... especially in coir.
 
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