There are two Aquasoils that are being mentioned nowadays. ADA Aquasoil and UP Aquasoil. The ADA is the superior one. The reports are coming from the UP Aquasoil breaking down. Although some are having success with it. ADA AS last alot longer from what I have been seeing on the web. In most case 3+ years. It also depends on if you let the AS supply nutrients alone or if you dose. Heavy root feeders can also help deplete the soil.