Frogster
Ratiocinate Extraordinaire (look it up)
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Thanks good info to know. I did check it and it was close to perfect like the last reservoir I mixed up. Where I started screwing up with the last one was I was running a water pump inside the reservoir 24/7 which was doing two things, it was heating up the water and it was aerating the mix as well causing the pH to go up to which I was adding pH down. I now have it on a timer that turns on for 15 minutes twice a day to mix things up and filter the mix a little and the temp and pH did not move after that. So I won't be checking it again. I might check when changing it next time just to see, but I am putting the pH up and down away.
Looking good.... they are a little on the slow side, but looking good.
Re the water pump. I have been running a water pump in my Reservoirs for the last 2 grows... without it effecting the PH at all.
When using a water pump that is set correctly, no additional air is added, PH remains the same (as opposed to airstones - that do raise the PH). It should be set to just break the surface tension of your res.
So maybe it is Nutrient based, far more likely. Especially when using a bit of this and a bit of that. You only need one of them to react under stimulation.