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KingJohnC;2173801 said:

GroundControl;2172128 said:

Thks

I checked the ph of the solution in the farm it self and its back up to 7.2
The youngest plant is starting to show deficiencies already.
GH PH Down apparently doesn't last very long.
Id imagine I can use vinegar to drop the PH. Going to go search that now.

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The reason your pH rises may be from 2 factors

1) As the plants use up nutrients from the nutrient solution the pH will rise if the solution strength is less then required by the plants. When your pH rises and your PPM drop your plant is using more nutrient then water and the nutrient strength can be slightly increased. When your pH drops and your PPM rise your plant is using more water then nutrients and your nutrient strength should be slightly decreased. You are attempting to find a balance between the current requirements of the plants and the rate that water and nutrients are used in your nutrient mixture to obtain a stable pH range. If you see slight nutrient burn on the tips of the leaves the nutrient strength should be slightly decreased.

2) If you are using tap water the minerals in the tap water will determine how much re adjustment is necessary to defeat the calcium buffering effect. You can use either pH down, vinegar or lemon juice to lower the pH of your nutrient solution but will use much more vinegar or lemon juice.

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