Scott,

You posted in the hydro sectionâ?¦.so Iâ??m going on the supposition that beyond the phâ??ing for your mother plant that you will be using this information in a hydro setup.

My situation is very similar in the respect that my tap water is 7 (sometimes) it actually varies between summer and winterâ?¦.in the winter it can actually be closer to 6.5.

So letâ??s imagine that you add 10 drops to 7.0 water and you come up 6.2â?¦..now you wait a day and as the water outgases the ph will rise to lets say 6.6â?¦.that is the result of the deacidification or out gassing of the water.

Iâ??m a bucket guyâ?¦..I do a nute change out. I add the water, nutes, and ph down to letâ??s say 5.7â?¦â?¦I check again later and the ph has risen to 5.9â?¦.I correct to 5.7 and before bed the ph is back up to 6.1â?¦again I correct to 5.7 and the next morning itâ??s back to 6.2. Sounds crazy right? But as the water outgases each time it takes less and less ph down to get the desired correction.

In the buckets are airstonesâ?¦and I push a lot of air through the buckets and the res/controller (which speeds outgasing). And it still takes at least two days for the ph to stabilize.

I am actually trying to answer your questionâ?¦..Iâ??m simply trying to convey that not only are you trying to hit a moving targetâ?¦..but that it takes a different amount of correction each time to hit it.

Hereâ??s a link on outgasing that may or may not help:
http://www.lenne-schule.de/fachb/Was...tsaeuerung.htm

I hope that in some way, shape, or form that this adds to your understanding,

As known,
HMR