During the last 2 weeks before harvest it is advisable to water the plants without added fertilizers in order to obtain as pure of a final product as possible. Advanced Hydroponics of Holland “Final solution” helps to decompose and remove the last residue of fertilizers in the growing media also, works as a prevention of mold. “Final solution” can be used with any kind of growing media as the only agent to be mixed in the water. Available in: 250ml - 500ml - 1ltr - 5-ltr