Quote Originally Posted by the image reaper
Warning: ... don't be as gullible as I was, upon getting your RO system ... I was under the mistaken belief that RO water is neutral-pH ... I got lazy, didn't bother to check pH, almost destroyed my plants ...
my city water, after the RO, is 4.5, highly acidic ... research led me to discover that tapwater chlorine breaks down into CO2, which acidifies the water, PLUS, the RO unit removes calcium, further acidifying, and removes magnesium ... this calcium and magnesium needs to be replaced somehow ... now, I no longer use my RO water for the plants ... it's easier for me to let the tapwater chlorine evaporate for a day or two, than it is to add the calcium/magnesium, and pH problems ... check your pH !!! ... :smokin:
I have kind of the opposite problem There's something in my tap water that buffers the pH way higher than I want, around 8.0. I was having a lot of pH problems, discussed here, until I started using RO.

Water supplies can differ a lot and sometimes it's just trial and error that tells us what works and what doesn't.

In any event, do like the Reaper says and check your pH - often!

PC :smokin:
PharmaCan Reviewed by PharmaCan on . R/O water systems as more time goes by i start to realize how important it is to use good water when growing. seems as tho every serious hydro grower uses R/O water. which leads me to my question. what type of R/O system do you have 3 stage, 4 stage? it is a portable system or a permanent system with res? how many gpd does your system filter? also do you also use a DI filter? i have been searching on fleabay for a system. looks like some good prices but not sure on the unit i need. looking at a Rating: 5