Question for the group. Doing a fresh water flush to bring my soil ph down Another slurry test done last night shows my ph at 7.1. I use R.O. water that tests out at 7.8 ph and 0020 ppm before adding anything. I recall being advised to add CaiMagic to the fresh water flush but now am unable to locate that post… should I add the calimagic - or go “competely fresh” with nothing added whatsoever ?
Adding R/O straight will not move your media’s PH at all. You have to have dissolved solids in your liquid to ‘force’ the media up. Also; you can not get an accurate PH off of straight R/O water as there is little to nothing to conduct. So; you get wonky readings. I water my plants daily and on water-only days I don’t even bother to PH: just pour it in.
Now if you think a flush will reset your PH then you might want to use a product like Flora Kleen or Sledgehammer and follow their instructions. If that doesn’t help; a couple of tablespoons of dolomite lime top-dressed on the media may help.
I was reading a package dolomite lime just looked up online…on the package it says it raises the ph… I’m looking to reduce the soil ph…could you explain further please.
It will raise it to mid 6’s (or lower it). It acts as a buffer to maintain PH. I’ve never needed to use it but others have. Let me tag an outdoor grower and let him get in on this: @Big123 are you on this side?
Be warned he grows BIG plants in BIG containers.
I’m in a 4x4 indoor. 2nd grow. High ph always an issue for me…yellowing leaves etc… even though my nute solution is always in 6.4-6.57 range and always us r.o… just dont know what do to and in need of some real correxrive guidance here.I’m 5 months in, should be done by now…was told not to go into flower until get ph stabilized otherwise is a waste…please please please help me
Happy cake day @sandrums
You may need some Gypsum, I would add earthworm castings too.
I figured you’d have some clue haha.
Gypsum eh… ok I go pick some up…5 gal fabric pots. Here’s some info on my grow that I sent to someone but got no response on…see below…
ello. Ok I’m reaching our again for assistance.I read the info you sent and get it, but apparently I do not understand how to properly fix it. I am still having a ph problem with a bubble gum auto and appears combined with periodic cal/mag deficiency. Got some serious yellowing going on. I am using r.o.water that tests out initially at ph 8.2 and about 0020 ppm. Using a non nutrient soil mix medium ( not MG or FF) and 3 bottles general hydroponics nutes and calimagic. I test my ph after adding cal mag and nutes . Ph of nute solution is always in 6.4-6.57 range and ppms around 850‐870. My last watering Sunday eve was fresh r.o water with calmag mixed at 1 tsp/gal ph reduced to 6.52. Did a slurry test with distilled water again tonight tests at 7.48 at 121 ppm. I water about every 2 3 days- when pots are light. Freshwater plus cal mag every 3rd watering ( nute, nute, fresh) Running HLG 2x qb 288 xls in a 4 x 4. 19/5 lights on/off. Cloudline ventilation. Humidity 60%. I am also growing a Gelato non auto. Much more lush and a darker green color like it should be but also showing some signs on upper growth. My plants are Likely Due for watering tomorrow. Kindly assist me please before I do so if at all possible.
Thank you both for your continued assistance
Autos prefer less fertilizer and nutrients, and can mostly get by with what’s in the soil. I never feed them anything until well into the bloom cycle if needed.
Have you tried a teaspoon of Epsom salt per gallon of water for a treat?
No I have not tried epsom salt. I did get both gypsum and earthworm castings and looked at direction which said for a 12 in pot a few tblspns of gypsum and about 1/8 inch layer of castings over the tip which I mixed into the top layer before today’s watering. Thanks for the assistance and advice… will keep you posted on progress.
Thanks for the referral to big123 !