Dissolve the gypsum first into sulfuric acid. Be
careful as the reaction can be quite direct!!
- Use a large beaker or other glas container (min 1Liter / 1 quart)
- Take 1gram of gypsum and put against one side of the wall of the glas container.
- ***PUT ON SOME SAFETY GLASSES***
- Use a dropper and carefully drop two or three drops of sulfuric acid in the glas container. Not directly on top of the calcium, but on the opposite side... Now swirl the container around. The reaction will take place immediately and the calcium will start to foam, be careful for your eyes as the foamy bubbles are a mixture of a base and an acid.
- repeat step 4 until only a clear liquid remains... (maybe 4 or 5 times, depending if you used two or three drops)
- Put the container on a kitchen scale and zero it. Add 1000gr of demineralized water (actually 999gr)
This should give you a 1L bottle with about 294ppm worth of calcium which is directly absorbable by the plants