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 Post subject: PH raise in new system?
PostPosted: May 10th, '17, 05:39 
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After a brief PH crash (4.5), raised it with pickled lime to buffer. I believe I am pretty much cycled with less than .25 ammonia, 0 Nitrites and 40-80 Nitrates. Currently having trouble raising PH above 6. Does anyone have dosing instructions for Calcium Carbonate, Potassium Carbonate and should I alternate them. The system is 2700 gallons, dwc no media beds., clarifier, fines filter, bio with K1 and a raft bed, 130 Tilapia fingerlings. Thanks in advance for any help!

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PostPosted: May 10th, '17, 08:44 
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I thought people added lime to lower ph?

People add potassium to raise ph?

Im kinda in the same boat. I dont think my ph is that low but lower than my pool tester could register. I added potassium and i think it is slightly better.

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PostPosted: May 10th, '17, 08:50 
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Calcium carbonate (garden lime), Calcium Magnesium carbonate (dolomite Lime), Hydrated lime and Potassium bicarbonate in a 6:2:2:1 ratio... Helps keep the Ca, Mg and K in ratio.

Add all the carbonate based products first, wait an hour or two and add the hydrated lime. Make the hyd' lime into a runny paste before adding, and as you don't have media beds, add it into the system at the furthest point from the FT.

You may need to adjust the ratio at some time in the future, depending on your source water and type/quantity of plants you are growing, so keep a keen eye out for the first signs of Ca, Mg or K deficiency and adjust rato accordingly.

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PostPosted: May 10th, '17, 08:59 
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wes1977 wrote:
I thought people added lime to lower ph?

People add potassium to raise ph?
Lime to raise pH, Potassium bicarbonate to buffer pH.

It's not the Potassium that's doing the job, it's the carbonates, we just add it in a form that's beneficial to the plants wherever possible, ie: the Potassium.

Potassium bicarbonate will have raised your pH a little, but it's primary role is to add carbonates back into the water. Hydroxides are very efficient pH raising agents, carbonates buffer pH, which means the pH raised by a hydroxide will stay stable for longer because of the carbonates.

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