![]() I have to ensure that the PH of the Rockwool does not decrease below 5. That is the PH I want for my Rockwool, in this case. I have to gradually adjust the PH of the Rockwool until the PH gets to 5.5. ![]() However, if I only have tap water available, then I can use that, as well. The acidic water does so because it dissolves lime that forms on the Rockwool’s fibers during one part of the Rockwool manufacturing process.ĭistilled water is the best choice for this method of preparing Rockwool for gardening. One thing that I can do to prepare Rockwool for gardening is to soak it in acidic water.ĭoing so will decrease the PH of the Rockwool cubes. Preparing Rockwool cubes usually takes several days. The cubes should therfore be soaked in an acidic solution How to Start Seeds in Rockwool? Since lime naturally reduces acidity, it also increases the PH of Rockwool. Lime gets deposited on Rockwool fibers during Rockwool manufacturing. This is a result of how Rockwool is manufactured. Typically, the natural PH of Rockwool is roughly 8. In fact, Rockwool naturally has a high PH. One difference between Rockwool and other materials used in hydroponic growing is that Rockwool is not a PH-neutral material. I do have to test the PH to check the system’s PH during this process, of course. If that is the case, it means I can use the cubes since they are now stable enough for seed germination. Take them out of the water once they are done soaking.Īdd them to the hydroponics system carefully and let the system operate without any plants until the system’s PH remains between 5.5 and 6. I should let them soak for a maximum of 24 hours. The next step is to submerge the Rockwool cubes in water. Once they have soaked and their PH is decreased to 5.5, they should be ready for me to use in starting seeds. Use distilled water for soaking the Rockwool cubes. The acidic water decreases the PH because it dissolves away the accumulated line on the Rockwool cubes. This reduces the PH of the Rockwool cubes. Rockwool retains moisture well How Do I Prepare My Rockwool Cubes?
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