What is Z7? Z7 is the biggest technology breakthrough in the last 50 years for growers and the plants they love! Z7 is a super concentrated, two-part, commercial enzymatic cleanser. For best results, use Z7 at every watering or feeding; Field growers should apply Z7 whenever possible to keep pipes and drippers from clogging. Z7 is super concentrated and economical for indoor and commercial growers; It costs only 2.5 cents per gallon of nutrient treated (calculated on the MSRP). A one gallon set of Z7 treats 7,570 gallons of nutrient.