Thx for reply. I set my timer water up every 6 hours. 4 time a day . water sit for about 5 min in tray. today i dumped water out and ADD RO WATER added A&B @ 350 ppm . and i added 50 ml of bud candy , bud intaior , bud factor , rhino skin . senisyme . and in 27 gallons res. ppm is still 350 ...