(10 customer reviews)

Manna Pro Crushed Oyster Shell | Egg-Laying Chickens | 5 LB


About this item

Pellet size crushed oyster shell

Great source of calcium

Builds strong eggshells

Heat-treated for purity

Provides calcium

Heat-treated for purity

Contains pullet-sized crushed oyster shell and coral calcium

Promotes strong eggshells

5 pounds bag

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SKU: B000MD59TC Category:
  • Pellet size crushed oyster shell
  • Great source of calcium
  • Builds strong eggshells
  • Heat-treated for purity
  • Provides calcium
  • Heat-treated for purity
  • Contains pullet-sized crushed oyster shell and coral calcium

10 reviews for Manna Pro Crushed Oyster Shell | Egg-Laying Chickens | 5 LB

  1. Shmaty

    Rinse…a lot! Very dusty. Will 100% cloud up an aquarium if you dont take your time rinsing it first. I placed mine in filter bags and put inside my filters(hob and canister). I’ve also scatered it amoung the sand. Every aquarium is different but this worked for my shrimp and snails. Brought the parameters inline with my needs

  2. R. Turner

    This is the standard oyster shell for layers. Same size shell pieces as in the large bags that you could get at a feed store (if you have a feed store). Especially during covid lockdown it is essential to be able to get this product delivered to my apartment. I normally buy the large bags at a feed store in Vermont but am restricted to New York city for the duration. Grateful to be able to get this oyster shell and at a reasonable price.

  3. Kaitlyn

    Idk how good these are for chicken food, but they work great for succulent mix. I needed something kinda small to help with drainage, and these worked GREAT!! Almost too well in fact.Traditional rocks for succulent mix cost an arm and leg, but these work great for less than $5.

  4. Chad Coley

    Great product, my Hens had better eggs within two Days! I’m going to buy again, but there is something people should know and I DO NOT blame the manufacturers for my grave error.Do not put this in your chickens food. Throw it on the side, like we do salt shakers, so the chickens can choose how much their bodies need, similar to us and salt. This is a mineral to them just as salt is to us, but the two serve different purposes. I made the mistake of putting this in my chickens food, and my sweet Coco-my first chicken the leader, ate too much and died. I don’t blame the manufacturer but I wish this is something someone would have told me. I gave them 1/4 cup and that was too much.I’m sorry to make a sad review, but again, the product is great and works, just don’t overdue it as it can be toxic in large quantities.

  5. batiekutler

    I mix about a cup of this into the 1/2 gallon jug of chicken treats I make. It has really improved the quality of my chicken’s eggshells and they have no problem with the size pieces that it comes in. It’s nice that the pieces are slightly larger. That way, if they sit on the ground for a bit, the chickens can still peck at them because they don’t degrade so quickly. Will buy again.

  6. Christine K. Cornett-McVay

    Our chickens really love these and we have had no problems with thin shelled eggs. Most of our eggs are large to jumbo, so our hard working hens really need a great calcium source. These are a high quality oyster shell that are a good size. Texture is a high standard. The re sealable bag helps keep them fresh. There’s a lot in one bag. We have 110 chickens and it usually lasts a week. We leave in a bowl so they can free feed at any time. I’m very happy with the shell and membrane thickness of our eggs. I will probably end up putting these on a monthly delivery schedule. Look, feel and smell fresh.

  7. Davida Kilgore

    Perfect calcium supplement for you chickens. Strong bones for you chickens and hard shells for you eggs. It says you can give separately or mix in with their food. I do both. I mix in one of these bags to one 50lb bag of layer feed and I also have a shaker (made from a non dairy creamer container) that I use to sprinkle in with their daily “treats” ( a bucket full of the days scraps). Eggs are great and my hens are happy and healthy.

  8. Cheyenne Bennett

    A must for laying chickens. My eggs started to get hairline cracks or even a small puncture hole that happens when the chickens push the eggs under them. I was also getting rubber eggs from my newly laying pullets. After this, the eggs haven’t had any cracks or holes and the rubber eggs are now a thing of the past.

  9. Amazon Customer

    I’ve had an issue with PH dropping in my goldfish tanks and know that crushed oyster shells/coral placed in the filters does a great job at buffering and stabilizing PH. I was searching for crushed coral to use and this product was included. A few negative comments said that it was too coarse for chickens, which makes it perfect for my use. Long story short, same ingredients as stuff sold for aquarium use, it works great, is heat treated which logically eliminates concerns for parasites in the product, and, most importantly, is half the price of products sold for aquarium use. Can’t say how it is for chickens, but will say it’s good for aquarium PH buffering. Advice to fish keepers, do some ingredient and price comparisons and you’ll no doubt save considerable money on food and aquarium supplies.

  10. Lana

    I used this to stabilize the pH in my freshwater aquarium.I haves 36g tank. My pH was going wild during cycling. Ph out of my tap is 7.2 and I have 0 kH.I added 1/4 cup of this to my filter in a media bag.My ph has remained at 6.8 since no matter the water changes.My Kh is still very low (2 drops) but my ph is DEFINITELY more stable.If you are using this for a freshwater aquarium – it will work to raise ph your very acidic water.Know your goals and add VERY slowly with daily testing.

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