Lemi Shine Detergent Booster, 710ml

Is this product cruelty free?

If it is supposed to stop hard water spots. Souldn't you have to add it to the rinse cycle. Otherwis you rinse with hard water and accomplish nothing?

We have SUPER soft water, will I need to use lemi-shine?

What is the difference in this product (12 oz for $11.15) and lemi shine dish detergent booster powder, 12oz, natural citric extract (walmart $3.93)?