Hi all, been using Coco for over 3 years now.. and loving it! and i don't understand why more don't give it a try..it really is amazing stuff especially if you like the biggest yields and the fastest growing weed! Well my tap water has very low ec around 70, so i always used sum type of CalMag, as Epsom Salts never worked, but then last year i gave it sum thought, and worked out it was mainly Calcium i need, so i started making my own. I make my calcium spray by using the shells from 5-6 boiled eggs, i then crush them well, then boil all the shells in a pan of 3 litres of water. Bring to the boil and simmer for 1 hour then remove from the heat and allow it to cool for 48 hours. Strain the water off the shell fragments and spray!!. I then store mine in an airtight container in an cool dark place. Do any of you make your own using eggshells?