Ph flux question

[orion6324]

Ok so i been growin a long time and i dont have a noob question here. Im in an ebb and flow systen using GH floranova. Everytime i change my rez or make up a new solution at all. It takes about a week before Ph stables out. I can handle it and it doesnt affect my grow but why does it do this? Medium is 1x1 rockwool in hydroton in net pots. Raises to 6.4 6.5 everytime i change or makeup a rez. Why?....anyone know...i like to keep it between 5.5 and 5.8

 

[Mr_Spliff]

are you using tap water?

 

[orion6324]

RO water

 

[george j warner]

its normally the hydroton dude ..i got a 18 pod drip system what i do is change nutes and adjust ph to 5.5-5.6 even tho its should be on about 5.8(stir well). it doesnt hurt the plants at all but it does add as a buffer to the rising ph level. a week later i check and adjust it .... just by chance when was the last time you washed your clay?

 

[ubet28]

Also if you put some air stones in with the water you are making this seems to help. I also make my water 5 to 7 days before i am gonna use it. I still get some swing like .3 to .6. But nothing like a full point every 5 to 6 hours for 3 to 5 days in row like it used too.

I see this question a lot and it always seems to me that the people having the issue are using R/O water and Expanded Clay.

 

[stucklikechuck]

i was having the same issue using tap water and 6" rockwool slabs. i am thinking its algae so i will see if this corrects the problem...

 

[littlebud]

rockwool and tap what a compo...NOT! rockwool is crap anyway in my humble opinion...but thread starter it is your hydrotton it will raise ph always untill it is balanced to the ph you want it

 

[stucklikechuck]

tap water here is good. 7.0 ph 80 ppm. and i havent had much problems with the rockwool yet, tho i am going to change to pellets...

here is a shot 20 days into veg with the tap water and rockwool "what a compo...NOT"

 

[littlebud]

to each his own i think rockwool is hard to ph balance promotes root rot and sucks ass but hey thats just my opinion

 

[george j warner]

wow their not big lol