Bumble Buddy
Active member
I think I finally figured out what was causing yellowing and "rust" spots on the fan leaves of my plants since I started using coco coir: I found a water report for my municipality, the TDS is around 400 mg/L and the CaCO3 (calcium carbonate) is around 200 mg/L! IOW hard as hell. I think that the CaCO3 has been precipitating out of the solution and probably fugging with the Mg and P as well, additionally I think the media pH has been rising as a result, causing further precipitation and locking up the cation exchange capacity of the coco.
I've been using GH Hardwater Micro and Bloom in a proportion of 2/3 with ~1g MgSO4 (epsom) per gallon. The Hardwater Micro bottle states that it is intended for use with water that has greater than 70 ppm CaCO3, so my water had way more than that at ~200 ppm. I recently got a reverse osmosis unit and have started using the RO instead of tap; I'm thinking that I should probably run the nute solution at ~5.5 pH for a while to dissolve the scale buildup from the coco.. I'm thinkin' that after things get back into equilibrium that I'll pH my nutes by adding a small amount of tap to the RO. only problem is my damn pH meter is giving me trouble, even after replacing the probe gonna have to wing it for a while... whee. I'm excited though cause this has bedeviled me for a while and I think I've finally got the solution.
Anyone else using coco with tap water 'round these parts had similar issues?
I've been using GH Hardwater Micro and Bloom in a proportion of 2/3 with ~1g MgSO4 (epsom) per gallon. The Hardwater Micro bottle states that it is intended for use with water that has greater than 70 ppm CaCO3, so my water had way more than that at ~200 ppm. I recently got a reverse osmosis unit and have started using the RO instead of tap; I'm thinking that I should probably run the nute solution at ~5.5 pH for a while to dissolve the scale buildup from the coco.. I'm thinkin' that after things get back into equilibrium that I'll pH my nutes by adding a small amount of tap to the RO. only problem is my damn pH meter is giving me trouble, even after replacing the probe gonna have to wing it for a while... whee. I'm excited though cause this has bedeviled me for a while and I think I've finally got the solution.
Anyone else using coco with tap water 'round these parts had similar issues?