Get a fish tank or big container and an air pump. I use 2 pumps in a ten litre tank. Put the water and the organic feed in there and wait 24 hours with the pump on, the ph does rise. I know this as I do this all the time. Oxygen will change the ph, it may go down for 2 hours, but don't worry, that's just whilst the water and organic nutes get rid off all of the crap in the tap water, but then it will rise. I feed my plants ph perfect feed every time. Oxygen is ph down and ph up. Also, if you grow organic. Bio bizz grow is lowers the ph, bio bizz bloom rises the ph, same with bac organics. Plant magic, not the case, they knock the ph miles off. Looking at a 48-72 hour buffer in the tank for plant magic nutes. I now feed my soil ph buffered feed, so my plants can feed from the soil immediately. I always found any deficiencys picked up were always either just before or just after a feed. Since using the oxygen method, I don't get any defs at all!