OK, well I found out what the cause of my problems were. I posted about some curling/canoeing leaves and some brown/rust spots I was starting to see on a few plants. I decided to flush and the initial runoff was pH 5.0! I was using distilled water to flush (pH 8.0) and then switched to pH'd tap water (pH 7.1).

Anyway, I flushed the 5 gal container with about 4-5 gal. I ran out of time in the light cycle or I would've flushed more. But I only got the pH of the soil runoff up to about 5.4 after the flush. So, I'll probably need to flush again when it dries out.

So, how did my soil get this acidic so fast? I'm using Fox Farms Ocean Forest cut with a small amount of perlite (10-20%). I also added some powdered agricultural/dolomite lime although the dose was negligible. I used like 5-6 tablespoons for an entire bag of FFOF, so not very much. This plant is only 5 weeks old (from clone). It spent it's first 4 weeks in a 1-2gal container and was just transferred 1 week ago into a 5 gal container with fresh FFOF. So, how did it get this acidic this fast!? I water with pH'd water usually around 6.8. I did initially water with lower pH (maybe 6.0-6.3), but that was only for a week awhile back. I've only fed nutes once (Humboldt Nutrients) and the solution was pH 7.0 and only like 300-400ppm.

I think FFOF just sucks... Am I going to be battling low pH now throughout the remainder of the flowering cycle? What should I do to combat it? Should I water with like pH 7.0 water? Higher?

Peace:rastasmoke:
lampost Reviewed by lampost on . Soil runoff @ pH 5.0!? How did this happen so fast? OK, well I found out what the cause of my problems were. I posted about some curling/canoeing leaves and some brown/rust spots I was starting to see on a few plants. I decided to flush and the initial runoff was pH 5.0! I was using distilled water to flush (pH 8.0) and then switched to pH'd tap water (pH 7.1). Anyway, I flushed the 5 gal container with about 4-5 gal. I ran out of time in the light cycle or I would've flushed more. But I only got the pH of the soil runoff up to about 5.4 Rating: 5