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Derek calls it right! Many folks I know who have used Roots original or 707 found the lin=me sourcing to be a bit weak, with some pH drifting happeni9ng later in the grow,... some extar EWC is a nice addition too! I you use dolomite with auto's, make sure it's a fine, near powder grain size,.. dolomite is the slowest acting/breakdown of the lime, due to some different chemistry vs typical limestones,.. too course, and it may not get busy in time.... some of the man-made ones are nice too, a combo of faster acting and longer term releasing,...
Earth Juice makes nice stuff-

.. the Natural pH Down is basically citric acid, so if don't want a 3 year supply of it, you can use canning citric acid instead,... same stuff! And tiny amounts are all that's needed unless the water is half dissolved rock!
You heard right about Fuxfarms OF soil!

it's hands down the [HASHTAG]#1[/HASHTAG] problem soil I see at the Infirmary,.. my own testing with an Accurate 8 soil pH probe (you must get one of these!) showed bags in the low f'ing 5's pH-

unbelievable that shit makes it to market! Also, lots of complaints about too many rock, raw sticks and bark,.. just plain poorly cooked, rushed out the door,...

... they use urea ti try and speed age the forest composts, and the quality control on that and other things is dicey!... Some folks get OK bags too, so I suspect it has a lot to do with individual production plants and sourcing,.. Happy Frog seems a little better, but not always,...... I've used Sanctuary Soils Victory blend and Empire Builder (richer) before, nice stuff,... this year I tried Vermisoil, and like it a lot too for my Biotabs grow outdoors,...Vermifire is too hot for autos, at least initially,...
About the A8 pH probe, this is a must for soil/soilless growers,.. nothing beat in-pot measurement, run-off is crude at best, and a PITA to do right if you follow the guide we have here in the Infirmary sticky article section,.. between that probe, a TDS/EC meter, and a pH meter (liquids only; mandatory calibration solutions storage solutions or it will lose accuracy fast, and die young), and adjusting your inputs (Ca-Mg first, always if needed), you have all the tools you need to steer clear of most any pH issues during your grow-
