the main thing that i can think of is maybe the ph up/down soultion.. mainly ph down... dont use the up often..... i get water let it sit out for atleast 48-72 hrs and then test..it is a more often than not 7.5ish.... i add ph down to around 6.5 for watering days and on feeding days I get water to 7.0 and add FF nutes.. usually bringing ph to about 5.6 so i add ph up to get solution to 6.3 and then feed.... when i flushed the runoff all came out at 6.3-6.5 any ideas about it?