Updated
Follow the instructions in this article to sanitize and soak your rockwool at the start of every grow cycle, before a single seed is placed. Rockwool leaves the bag at a natural pH of about 8.0, and the target for germination is 6.0, so every sheet gets the same treatment. Follow the steps in Keeping your Flex Acre Clean before you begin.
We recommend gloves and long sleeves while you handle rockwool, as the fibers can irritate skin.
Step video coming soon.
Sanitizing and soaking are two different jobs and they run in a fixed order. The spray sanitizes your rockwool. The soak, in the next section, sets the pH. The mesh tray is the one container your sheets stay in from here until they reach your seeding area, so load it once and leave the sheets in place.
Use the rockwool supplied by Fork Farms. It is matched to your Flex Acre and sized to the plant spaces in your Panels.
Step video coming soon.
The soak is doing two things at once. It lowers the natural rockwool pH from about 8.0 to the target of 6.0, and it saturates the rockwool with moisture so your seeds sit in a wet cube from the day they are sown. Pull the sheets early and you keep both problems, a pH above target and a dry core. A finished sheet is heavy with water when you lift it out of the tray.
Step video coming soon.
The non-draining tray is what keeps water off your floor between the sink and your seeding table. Your sheets are saturated at this point and keep releasing water as you move them, so give them the sink first rather than the walk. Keep the two trays stacked together, as the mesh tray drains into the non-draining tray again during seeding.
Your rockwool is now sanitized, saturated and sitting at a pH of 6.0. Well done!
Next: Seeding & Labeling your Trays (Part 2 of 6)