Block Clean

Block Clean is a ready to use spray designed to remove unwanted green algae from your growing media.

This powerful algae treatment spray is perfect for keeping your growing media clean and hospitable for your plants. Unwanted green algae can be the perfect breeding ground for devastating diseases and infections and steps should be taken to eradicate it as early as possible. Block Clean spray can be used on any growing medium which attracts biomass and it is completely safe for your plants so there's no need to remove them from the media before using the spray!

It is not recommended to use Block Clean on seedlings or cuttings as doing so could cause undue stress at a tender stage in plant development. In some severe cases of biomass build up multiple applications may be required to completely eradicate the algae from your growing medium.