d42zero
Well-Known Member
Hi,
I'm a first time grower trying to understand pH. I'm growing in coco but I've posted here as I'm interested in the water itself and how pH works, and I'm talking about FRESH solution before it goes anywhere near the plants.
A few days ago I mixed up 20 litres with a pH right on 5.8, today when I was watering I re-tested it and the pH was right down at 4.6 Remember this solution is fresh so I was expecting it to still be the same but it's changed LOADS..
Then tonight I mix up a new 20l batch and I had the same problem I've been having for weeks.... it tests 7.6 after calmag+nutes so I add 0.8ml ph down (Hy-Gen brand) and it drops to 7.1... so I add another 0.8ml expecting it to drop another 0.5 or so, but this time it drops to 4.3. I add 0.8ml ph up and it goes to 5.0, so I add another 0.8ml and it goes to 6.3.
So why would the pH of my un-used nutes change so dramatically over a few days, and why doesn't it behave in a linear manner when using up/down?
Cheers
I'm a first time grower trying to understand pH. I'm growing in coco but I've posted here as I'm interested in the water itself and how pH works, and I'm talking about FRESH solution before it goes anywhere near the plants.
A few days ago I mixed up 20 litres with a pH right on 5.8, today when I was watering I re-tested it and the pH was right down at 4.6 Remember this solution is fresh so I was expecting it to still be the same but it's changed LOADS..
Then tonight I mix up a new 20l batch and I had the same problem I've been having for weeks.... it tests 7.6 after calmag+nutes so I add 0.8ml ph down (Hy-Gen brand) and it drops to 7.1... so I add another 0.8ml expecting it to drop another 0.5 or so, but this time it drops to 4.3. I add 0.8ml ph up and it goes to 5.0, so I add another 0.8ml and it goes to 6.3.
So why would the pH of my un-used nutes change so dramatically over a few days, and why doesn't it behave in a linear manner when using up/down?
Cheers