i hear ya bout the internet !!! i water for about 20 min each morning with my recirculating system, with 2 gal an hour drip emitters. that has 3 ft slabs. the widow in the block i water drain to waste when it starts to dry alot,,,,about every 2 days. i have flushed the rockwool. i have b een growing with the reciculating system for years and the "watch the ppm level in the res" worked fine but not fantastic and i never got over 800ppm that way). thats why im trying the blocks with drain to waste. i heard its easier to control than the slabs. problem with the slabs is when you flush you saturate the slabs and risk root rot overwatering. do you suggest watering the block (drain to waste) increasing strength from the 1100ppm??? i guess what im asking is . i have increased the nute strength to 1000ppm in the pix...are my plants telling you that it needs more nutes overall? or just N. also i havent had a grow in 10 years that didnt have leaf tip burn. recipe is gh flora 3 pt 0 grow 1micro 2 bloom ratio with 1/4 tea per gallon koolbloom. i read a thread that suggests i use 1/4 grow in the ratio with this recipe