They are too big.
I have not compared them. I have only used the one.
Do not know your answer, but I would not want to guess at it. Ask someone from UCR or such a place. Try San Diego Zoo because what you put in the deer may get into you. I am guessing you hunt them for food.
Yes, 100% safe.
There is another product in a blue bag that I made for removal of iron. If you’re asking about flakes of rust in water, then a swirl filter and/ or a sediment filter before the water softener is advisable. Otherwise large particles will shorten the life of softer.
You need to call Castleton
You have to supply of this product. Can't give you a review on something I didn't purchase.
99.9% sodium chloride, 0.03 percent Sodium Hexametaphosphate