I'm with HM on this also.Trying to get your runoff correct is like a dog chasing its tail.As long as your intake water is correct you should be in good shape.
Haunts- for an accurate pH test, in as much as the faulted run-off method can give, you use only water, which you need the starting pH of,... remember, nutrients alter the pH a great deal, usually acidic; this added stuff in the testing will muddy the pH waters totally!....no need to use DI or RO water, use what you usually use; if it's in the 7's pH, don't mess with adjusting it at all; you'll need this starting water pH to run the calculations,... RO/DI water has all the buffering minerals removed from it, so they're prone to wild pH swings from even small inputs,... the carbonates found in tap water (mainly CaCO3) are what helps buffer pH.. super pure water like RO/DI will also dissolve more stuff out of the soil, out of proportion to tap water that has significant hardness to it (dissolved solids, i.e., CaCO3)...thus skewing the pH readings as well,... otherwise, follow those directions, yes,.. I've only done the run-off testing a few times, found it dubious, and promptly score that Accurate 8 unit,...
After the test and calculation it came out as 5.8 so the ph might not be so bad after all, ive got one of those Accurate 8 meters on its way but it can take up to 4 weeks to arrive i'll update when it arrives.
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