Mrs. Wages Picling lime is HUMAN FOOD GRADE Kalwasser. lime, calcium hydroxide. use it just like Kalc, because it is. mix a couple teaspoons in 5 gallons of RO water, mix, let settle an hour, then syphon the crud off the bottom. the clear upper water is very high PH and saturated with calcium. use that in a drip for make up water, but watdh your PH closely.