Reddit reviews Scratch and Peck Feeds - Cluckin' Good Oyster Shell Supplement for Chickens and Ducks - Flaked - 4-lbs
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ADDITIONAL CALCIUM SUPPLEMENT - Laying chickens and ducks required additional calcium to replace the calcium being used to form strong eggshellsNOT A SUBSTITUTE FOR GRIT - Grit is necessary for the healthy development of a chicken’s gizzard. The gizzard aids in digestion, and allows for maximum nutrient benefit from whole grain feedsFLAKED OYSTER SHELL - Flaked for easier absorption. Using a flaked oyster shell helps birds more easily consume the calcium.INCREASES EGGSHELL STRENGTH - Calcium helps chickens and ducks lay eggs with strong eggshellsFEEDING INFORMATION - Begin to offer Cluckin’ Good Oyster Shell to your hens when they are nearly laying, approximately at 18-20 weeks. We suggest free choice in a separate dish or tossing on the ground in their coop area to encourage natural scratching behavior.
This is what I use in my Mexican Ping planters and pots (I use it for a few other calcium loving plants in my other collections also). A small handful to several cups of other, standard Mexi-Ping mix only. A little goes a long way and it is slow release. Here is the exact brand I purchased (it was my second bag I've gone through and it's still nearly full despite the fact I purchased the new bag in 2015 and have lots and lots of Mexican Pings:
https://www.amazon.com/gp/product/B00UIM7N0A/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
--- I understand the dynamics of using egg shell, however the amount of available calcium varies according to preparation, etc. I prefer the crushed oyster shell as its clean enough and pure enough to be edible for chickens. If you find another brand, do check for purity and always read the reviews.