Mr.Juice
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What's your PH in your 5 gallon carboy after you add 34% Phosphoric Acid? I add around 15ml to 5 gallons of water, that gives me a PH of 6.0, my water out the tap is 260ppm with a PH of 7.0
adding air does raise the ph,that might be the spike your having,i dont check my ph and ppm until all is made and adjust from there,guess im doing it wrong,without air my mix runs at 5.8 with air it's 6.0 to 6.2,when i get to 6.2 i add the hydroguard and the ph drops back around 5.9 to 6.0,once i started using the ro water ive had no more problems with any of it and as i mentioned i run the can outdoors in the blistering sun,no clue how warm water is,i just keep eye on the ph and ppm.I just finished a grow and was using 100% RO. And using CalMag to supplement. For the last couple weeks I’ve been doing half and half RO to tap water. Think I will continue that for the whole grow.
I would bubble the water and would pH before watering. It’s just crazy how adding the phosphoric acid BEFORE the bubbling caused a precipitate. Explaining my drop in ppm. Now that it’s been left for a while I can see sediment on the bottom. It’s a very fine white sediment.
Hy, how would you make a buffer solution with KHCO3 (Potassium bicarbonate) to have a pH of around 5,5–6. It would be used in a hydroponics system to make a buffer solution in RO water (demineralized) that can resist the acidic nutrient fertilizer. Tried with 60 mg/L and 90 mg/L of KHCO3, but unfortunately, the pH drops drastically to a level of pH 4 after 4-5 days, which is not good for my plants… IMPORTANT: the system is a passive system not bubbling CO2 in the solution!!!Yeah, I will just go back to bubbling like normal then pHing after. It was just a weird situation that I didn’t expect.
Pretty sure it formed a precipitate of calcium phosphate. This is my best guess that happened.
Bubbling air (containing carbon dioxide) creates carbonic acid, the carbonic acid reacted with the carbonates in the water and in the presence of phosphoric acid resulted in a displacement reaction producing calcium phosphate precipitate. Not that this has any sort of practical application, I just found it pretty interesting exercise to figure out wtf was happening here. Or at least attempt to lol
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