Calcium oxide is hazardous to handle. Be careful. There are much safer ways to put calcium into water. I would not take the risk myself. And magnesium sulfate is so readily available, and dissolves so easily, I would not use another source of magnesium.
Most plants have no trouble taking up enough calcium if there is even a small amount in the water. In fact, terrestrial plants actively exclude calcium from roots to prevent excess absorption. Calcium deficiency in orchids probably only happens when people use rain or reverse osmosis water exclusively. Rain usually contains dust, and has a slightly acid pH, due to dissolved carbon dioxide. The pH promotes calcium dissolution from the dust particles. If you have some calcium in your water you probably don't need to supplement.
The purported benefit of KLite is the much lower concentration of potassium. You can achieve this by using a smaller amount of MSU blend in the water. Most tap and bottled water is quite low in potassium, but it might be wise to check this.
The downside to using a lower concentration of MSU is less nitrogen supplementation. When your plants have optimum temperature and light for growth, you would probably want to give more nitrogen than they get with very dilute MSU. This can be done with small amounts of ammonium sulfate, readily available in the US (I don't know about the EU.) When plants are not growing actively very little nitrogen is needed.
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Hybrid Mode
