P.H control

got a problem with my nft system the ph keeps on rising every day
i just bought a larger water tank but still have the P.H problem. what would help? every time i lower it to 5.8 the next day will be 6.8 and if i was to leave it for another day it will go 7+
how can i stabilise it much help needed thanks

As your plants use up nutes your PH will change. This is a common misconception of hydro. People think that you just mix some nutes and leave them. Hydro requires constant monitoring. I check and balance my PH about every two days.

Do you have any pictures? How old are they? Do you know how much they drink a day?

I've heard if you use tap water it will fluctuate a great deal. RO (reverse osmosis) water apparently stays much more constant. I use tap water and i'm in the same boat as you. Someone with RO water should chime in on this one.

I am having this prob myself. I am reading the ask lucas thread at cannabis world and he suggests that ppm maybe low as ferts lower ph. So maybe up the ppm a little? As your plants eat the water gets less acidic due to nute loss. What is you ppm level and nutes?

tea tree said:

I am having this prob myself. I am reading the ask lucas thread at cannabis world and he suggests that ppm maybe low as ferts lower ph. So maybe up the ppm a little? As your plants eat the water gets less acidic due to nute loss. What is you ppm level and nutes?

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ppm was 0.8 they are baby they have been in the system for a week now, so i have just flushed for 2hours with just ph water at 5.5 and a drop of h202 now i have re done my tank and its set at 1200ppm and ph is 5.7 lets see how things go tomorrow

What kind of water do you use??

I use tap water my self and have not had a problem really. PH fluctuating a little bit wont do any harm. How much does it change in a day? How are you mixing your nutes?

........everybody's tap water is different...... depending where your located.....I know when I used tap water my ph fluctuated like crazy......that causes problems in hydroponics...aero....I don't have to adjust my ph but once maybe twice every res change....I use ro water......