I don't know if this even works this way but really can't see a reason it shouldn't, I took some of the dirt I had left put some in a jar with the water I use and shook it up and let it sit till the dirt settled and then tested the water and by the color indicated it to be around 7.5 to 8. The ph actually went up some. I used some stuff called earth recharge that supplies microbes to the soil and I thought that in organics those help control the ph. On the back of the bag of Whitney farms organic soil says this is whats in it, "Regionally formulated from organic materials (including one or more of the following: forest products, peat humus, or compost), sphagnum peat moss, composted manure (in Florida cow manure), pasteurized poultry litter, alfalfa meal, kelp meal and fertilizer".