I use Fox Farm Happy Frog and have chronically low PH in my runoff. Multiple plants, multiple grows across multiple times.
I have calibrated a higher end PH pen so I know thats not the issue. Soil is supposed to be 6.3. - 6.8.
Today is the first time I could water my new crop of plants to 10% runoff. The PH going in is 6.9 out is 5.6. Multiple plants all in the same soil (different pots of course). So why do all my plants have such low PH in the run-off? is FFHF not as PH balanced as they claim?
Every time I have had similar problems in Happy Frog it has been due to salt buildup about mid way through flowering. I perform a flush and the pH of the soil corrects back to ~6.5 immediately after the flush.
Not sure a flush is going to correct the issue and something else may be going on. Can you please tell us other things about your general grow environment (maybe other additives) in addition to the water source as Audiofreak has asked?
Sounds like the same as my tap water…any visible signs? Full plant pic may help those more experienced to notice something. This is the first time I’ve heard this issue with ffhf. @BobbyDigital may be able to help.
My first thought. 5.6 is below nominal but still within soluble range for most nutes. As stated; FF recommends flushing salts at different intervals to correct just this issue. If not doing so you should be.
Two drops in solution to adjust means fairly soft water. This means that you will never be able to adjust the soil PH by running adjusted tap water.
I too have heard reports of low PH batches of FF.
Remember too that the PH will naturally drop throughout the grow. As organic material breaks down it acidifies the soil.