what ph is reverse osmosis water?
- Thread starter Thread starter rr14
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BruceLeeroy
Active member
in my experiences very low ppm water coming out of an RO setup tends to be acidic, usually 5.0-5.5. i always thought it would be neutral but that just never seemed to happen. it is also VERY touchy and will be adjusted with just the tiniest of nudges, which is why most people add nutes before PHing the water i believe
BruceLeeroy
Active member
hey radium do you adjust your ph before or after adding nutes? if before, what nutes do you use and how does adding them change the ph?
Normally RO water is from 5.5 to 7.0 pH, depending on how much CO2 is dissolved and pulling the pH down...
It took me a couple of days to accept the fact that radium's RO water is acidry (~4.7),...
You should be able to add the pH up first, then the nutes (unless you are using potassiumsilicate for pH up), but only if you know how much of it you need of course
It took me a couple of days to accept the fact that radium's RO water is acidry (~4.7),...
You should be able to add the pH up first, then the nutes (unless you are using potassiumsilicate for pH up), but only if you know how much of it you need of course
Magic Bean Grow
New member
RO water doesn't contain much of any dissolved minerals to buffer the pH. So the pH can vary wildly depending on what traces of minerals are in it.
I recommend adding the pH adjustment after mixing the nutes since they will buffer the pH in the final mixture.
If I recall correctly, a charcoal final filter (carbon block) can lower the pH, so ~4.7 pH is not all that strange.
-- MBG
I recommend adding the pH adjustment after mixing the nutes since they will buffer the pH in the final mixture.
If I recall correctly, a charcoal final filter (carbon block) can lower the pH, so ~4.7 pH is not all that strange.
-- MBG
RuralRoute420
Active member
.
.
add nutes, then ph
most nutes will drop your ph. i always have to add UP when adding nutes....it sucks.
what's that called when your nutes won't affect the PH? buffered? does buffered mean it will or won't affect the PH if this is correct?
.
add nutes, then ph
most nutes will drop your ph. i always have to add UP when adding nutes....it sucks.
what's that called when your nutes won't affect the PH? buffered? does buffered mean it will or won't affect the PH if this is correct?
G
Guest
7.5 out of the tap.... and 6.0 after being filtered with my RO unit.
RO water IS going to need Cal-Mag and that will further drop the PH.
RO water IS going to need Cal-Mag and that will further drop the PH.
HYDRO KING
Member
yea
yea
7.5
yea
7.5
It really doesnt matter what ph you ro water is, because it has so very little buffering capacity to it that anything at all that you add to it, or that you add it to will dominate the ph determination. It is totally unimportant with ppms of 24 for example. You could breath on the water for an hour and your co2 would change the ph.
HYDRO KING
Member
huh
huh
man stop trippin on the water ph before you add nutrents rr14, trip on it after. I never seen anyone care this much?
huh
man stop trippin on the water ph before you add nutrents rr14, trip on it after. I never seen anyone care this much?
well, the problem is that I'm dealing with crappy test equipment. I don't have an electronic meter yet so I'm using my aquarium stuff. You can't really test the water once the nutes are in there because it dyes the water and throws off the readings. I'm going to pick up an electronic test device tommorrow.
I bet you would care if your plants looked as crappy as mine!!
I bet you would care if your plants looked as crappy as mine!!
J
James-Bong
PH= 7.0
3 stage RO
3 stage RO
