Put egg shells Thur a food grinder to make power first, grinder blade with 1/4 " holes works good. next fry,cook bake or use a torch make good and black, pour into glass jar,pour in white vinegar cover over the top of the blacken shells put top on very lose let set for 7 to 10 days the acid in the vinegar dissolves the calcium TO MAKE IT WATER SOLUBLE instant uptake by the plants. MIX 2 Tbsp to 1 gal of clean water RO is best no more as it's very strong.have used it for 5 years works good. Is that so tuff to understand
(ground egg shell is still egg shell)