House & Garden Aqua Fakes is a complete base nutrient specially formulated for use with diatomite, expanded clay, rockwool and perlite. Recirculating systems require specially balanced nutrients due to the longevity and stability required to deliver maximum growth. House & Garden Aqua Flakes A&B Base Nutrient is composed of liquid main and trace elements and contains no bulking agents like solid fertilizers. Aqua Flakes is composed of the purest, high-quality nutrients that are available on the market, including iron (Eddha-FE) enabling the plant to absorb nutrients quickly and effectively while remaining pH stable. In short, if you require maximum results from your recirculating system Aqua Flakes A&B is the only choice.