all i know is its been almost 10 years since ive starting using them, and im noticing tons of co's copying the 3-2-5 ratio common in all the canna specific a.n. gear. immitation is the highest form of flattery, so is defamation. each to their own. my work load is cut in half. when you have 18 reses @ 250 plus gall each needed daily check ups, ph perfect will make sense. with my other half time saved not ph-ing im building more grows and helping more people, thats worth more to me then a monetary god that most growers worship or are enslaved by, d