. that's ok can fix. must be the organics[fert] also noticed mold fungus on 2 pot edge tops. no problem easy fix. vinegar . won't be using that organic again.[trouble with organics is organics come with it] so my good organics got their ass kicked by the bad ones. no problem easy fix. flush clean treat. and add the good stuff in mass. and this week only water and the good microbes go in. the soil/pebble medium has enough stuff in it for this week and the fan leaf will show me when to change and start the veg/flower mix. going to put 6.5 ph water in. ohh not good most will say . lol the medium is low enough to balance it. and the plants wont shock too much. I have dealt with organic mishaps before. normally I use only chem ferts for the veg state and slowly switch to organics during beginning of flower thru to the end. but I was given free stuff to try and the label was damm near close to what I use. wont dis the manufacture but my survey will go in]. and be checking ph and tds every 4 to 8 hrs. and make slight adjustments if needed. 
when i find the females i want to cross with the alpha males i will transplant to smart pots.smart pots do 2 great things 1]air prune roots/prevent root bound conditions.
that's ok as rain water is normally 6.8 to 7.2 with less than 100tds.rain water is not pure folks it has to go thru the air , and ph and tds can be very different.
good thing you check before and after mixing the nutes.. Good luck with the cleaning with a recirculating system it should be as simple as you describe it.
. ph climbing 
, still low. took out 2 gallons and added 3 tap gallons[7.5ph]. reservoir looks good
. tds at 1000. still climbing. so far so good plants look good grew allot. lil stress showing 1 leaf here and one there
. 5 plants over the wire scrog
. took 1/3 fan leaf off. everything looks peachy keen
. some of the females gave me a strong peek today
.
took a few more fan leaf off of them to incourage side growth as males will be culled as i find them. need the branch to fill the scrog. out of the 4 master kush 1 started to strech fast so posible male there. none of the mk are showing any sex yet. they were all with in 1 inch of each other but this last night cycle 1 shot up 4 inches above the other 3 the other still remain within an 1 inch of each other. no new pics till sun the 13th. also changed the water timer to come on during their day time period. note during seedling and veg water on at nite. after 1 to 2 weeks of 12/12 water i switch to the systems day cycle. will be putting the next 2 red lights on tommorow . so will be in the full flower lighting stage. uv lighting to be added in about 2 weeks. going to delay it cause of interuption of the cycle to deal with city tap issue. so i am off schedule by 10 to 14 days.
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