Long story short I am 2/3 of the way through my first grow and am having a huge problem with my Fox Farm Ocean Forest soil being too acidic. I am getting runoff PH of 5.5. I had to do a 15 gallon flush to get it to a runoff PH of 6.2. Today I watered with 2 more tablespoons of dolomite lime (for a total of 4 now) and water PH’d to 7.0 and I got runoff PH of 6.0. I am really pissed about this as Ocean Forest is supposed to be PH’d to 6.4. I had also added about 25% perlite which is supposed to be around 7.0 to 7.5 PH.
I still have some of the soil in the bag and am wondering if I can put it in a clean pot, water it to runoff and test the runoff to obtain an accurate PH reading? I am not sure if this will work because you can’t accurately PH plain water and I don’t really want to waste my nutes for a test run.
That sucks other people are having the same problem, but I’m glad it’s not just me. I sent a message to Fox Farm directly to see what they have to say. It would be nice if they at least gave me a coupon or something.
A lot of people here successfully use Fox Farms, but I see post after post like this where it is an issue. Search for organic soil recipe if you are an organic person, or use Pro-Mix with GH Flora trio or Jack’s. Simple / foolproof.
You can do a slurry test to see what it is right out of the bag.
Mix equal volumes of soil and distilled water. (such as 1 cup of each)
Shake it up and let it sit for 15 minutes and then strain out the water, like with cheesecloth or coffee filter and check the pH. I would be interested to see what it measures.
Youtube has many videos about slurry tests. Some say wait 24 hrs, but 15 min is sufficient.
Run a slurry test instead. Put a cup of soil in a jar, cover completely with distilled water (must be distilled or RO water). Mix well and let sit for at least 30 minutes. Stain it through a coffee filter into a small container and then take you PH and PPM readings. It is a PITA to have to deal with that.
@Mmchugh42@Spiney_norman@beardless Here’s a dumb question. How the hell do I get the coffee filter off the top of my measuring cup without it sliding down into the cup and dumping soil back into my filtered water? I am currently on my third attempt and have the filter taped to the top of the measuring cup with painters tape. LOL.
Man the ph is really messed up. My last slurry was 6.89 and tds of 2007. How far along are they? Any chance of moving up to a larger container with different soil. You would need to let them really dry out first so the root ball isn’t damaged.