SB, i am sure your blue lab ph pen only just went outa sinc........so not to much harm done. Like you have mentioned, the ladies are quite hardy, and will auto compensate for a while.
Sb;.....earlier in the grow you put up the stats for your 20ltr stand alone DWC. Qs;.......are they based on "Half Strength Nutes as Bottle"..??......... say the canna base was 30ml (Veg) in 20ltr, is that half strength SB ??...........would it be pos to lay out the dose in mls per 20ltr ??.......this would be a great help to me and others im sure........especially in the flower period where doses increase etc relative to ec etc...........are you still adding 5ml silica SB?/.........
Ps; if your carbo filter is on the floor and cold air sinks when entering the cab. Are you not just sucking cold air into the carbo on floor ??................at the top of cab where hear collects is where you would best be drawing fresh air (Co2) in ??.and removing stale air etc.....is that write SB?/??.........i know the led do not produce a great deal of heat so carbo on floor will help keep heat trapped in cab etc, and temps up. But how dose the hot air get changed at the top of cab ??..................
pk13 boost at 13ml in 20ltrs 1-2wks post sex showing ??.................any help in calibrating 20ltrs with your nute choices, i would be gratefull...........as i have the DWC kit arriving nxt week. INH had a good grow with "Tundra" didant he...."Willma" who wouda thought it !!..........
genesis ph buffer 7.01 (i swear by this stuff) will be getting this agent in asap SB..............like you say 0.5 diff can make a big diff iff exposed to it to long in flower...............another valuable live lesson SB.........thank for it..........i am shitting it 4me 1st hydro run !! it will be 6 with 3-4 selected to finish..............my quantum bloom leds have proved ok in both phases. My big devils are chubby as "Danny Boile" !!..........But soil is over for me know. AB any calibration of quantity help appreciated SB........hellow to all and hope all is well with all !!...........
l.e.d doesnt work like that mate, drawing the warm air out of the room is related to hps growing, keeping an ambient temp with l.e.d is completely different, i have a fan inside the grow room circulating air and i also have air vents on the tent that let fresh air in plus im in the grow room at least 2-3 times a day so the doors are opened and full air can be exchanged, as far as the ph pen goes it was the buffer that was out of sync but its impossible to tell when it lost its reading although if i was to go back and look through my journal i could pretty much pin point it as i already stated its not to bad having an ec of 5.4-5.5 in veg but its not gonna flower your plants in that range
ill try and be as helpfull as i can but its strongly noted that im still evolving as a grower and adapting my system to bigger and better all the time so its constantly changing as are my methods
ive recently been reading about the lucas formula and the gh line of nutrients which got me thinking about n-p-k ratios, the lucas formula is supposed to be bang on for growing cannabis in dwc, the formula was compared to other nutrients like canna aqua which is what i use and it was stated that plants grown using canna aqua will show signs of cal/mag def so this got me thinking even more in terms of l.e.d lights producing cal/mag def and also the nutrients im using thats not to say that canna aqua doesnt produce good result i just feel that im not getting maximum return from my setup and i would be better using a whole new nutrient regime which is what ive chosen to do
i had 2 choices i could either stick with a 2 part feed and use gh micro and bloom and try the lucas formula and see if my results increase or i could opt for genesis line of nutrients which is a 3 part nutrient and tailor my own n-p-k ratios for every stage of the grow , the beauty of the genesis range is that i dont need any extras i just use the 3 part soloutions for the whole grow and add a pk boost when in the flowering stage so this also means ill be dropping all my root stim and carbo-load etc etc
sorry for rambling but the point im trying to make is their is no use in trying to copy my schedule because it changes all the time as i try and adapt to my setup and grow system my best advice would be to use the canna calculator
click here or use this method
click here and id also advise using a cal/mag suppliment, something you will notice with uk growers is they tend to go for fewer plants but bigger yields as oppose to our dutch cosuins who tend to grow smaller plants but in bigger quantities but thats the difference between it being legal in 1 country and illegal in another
after this grow ill be dropping canna and trying something completely different or after reading this you yourself might fancy trying the gh nutrients or it might of put you off hydro althogether lol, if im being honest growing is a subject that i can spend hours chatting about as its can get really indepth but at the same time it can be as simle as you want it to be
, I made a lot of mistakes from my side and not really with my first grow. And you are completely right, PH pen is ..... . Still I believe you will grow this ladies till they become monsters 
. With all your skills and love to the plants.
UK humidity sucks balls!!
