The next time you boil a dozen eggs, save the water and pour it on your garden and plants. The water becomes enriched with calcium when the eggs are cooked. Plus, why pour water down the sink when you can reuse it for something, right?
I have african violets from my Nannie's african violets, she passed in so have had mine a few years before her passing. They are still hanging in there, after years of giving some away many replantings.