I start off flooding mine 15 mins every 3hrs, then 30 mins every 3hrs, then decrease the gap as the plant gets bigger, therefore increasing the amount of feed rather than increasing the feed strength.
for higher humidity, feed shorter with shorter gap - if u want rh lower, feed longer with longer gap
Yes, ideally u need an accurate ppm / ec meter as well as ph meter, but they're not expensive off ebay.
Offset the cost of meters against the price of 1/2lb of bud
