I have a soil probe, I'll check it tonight, also I'll check the runoff next time I water with my drops too, but I really think the meter I have is accurate... I know that my water is 6.0, and it always reads 6.0 in the plain water... it does look like lockouts though, doesn't it? My last reading was between 6.0 and 6.4, I don't remember exactly... like I said, it doesn't seem to vary too much.
FK
Well... I'll preface this with a disclaimer... don't take my advice until someone else can corroborate it.
Maybe I'm doing something wrong... I've been watering with 5.5 - 6 PH. When I do this my run-off & soil probe is 6.5-6.8 or so. That's what I want right? I want the PH of my medium overall to be around 6.8 right?
If you're watering with 6-6.3 and getting a run-off of the same, I would expect your soil probe to show around 6-6.3 too.
I don't know... but to me it seems your mediums PH is too low over-all and you need to raise the PH of your water correspondingly a tiny bit.
Maybe it has to do with your water being naturally acidic... I've been pondering how rise of PH over the brewing period differs based on the PH of your water. Does PH just keep rising above the original ph of the water, or does it rise until it returns to the original PH?
I've wondered if PH of your actual medium rises after application as well. I mean if on day 2 of bubbling it's ph6 and on day 3 it's ph7... well if you water with the day 2 mixture does it continue to rise at the beginning while the soil is saturated? (I figure you've got a lot of that mixture that has a rising ph in there right)
Does your nutrient mix ever rise above that original PH level of water?
Maybe I put in 6-6.3 and get out 6.8 because my waters original ph is about 7.5 (I tend to have problems with high ph... even with no lime) I feel it's always trying to creep up... sounds like yours is always trying to creep down.
Sorry for the long kind of rambling post... hope it made sense, or someone can correct me.