Quote Originally Posted by Calicowinks
There are only 2 ways to lower the calcium...either drain and refill with softened water or use a sequesterant that has a high chelation ratio for calcium. These types of seqesterants are called 'Calcium Hardness Reducers' and will require maintenance doses on a regular basis just like sequesterants for other metals do. (Calcium IS a metal!)
What is your recommendation for a calcium sequestrant for pools with high calcium?

Thanks so much for your thoughts! I appreciate the time you took to give me details!

Take care,

Shari[/quote]
Most well stocked pool stores will carry them. They might be called calcium hardness reducers or scale inhibitors. They are phosphonic acid derivatives and are very similar to metal seqeaterants. You can also google calcium hardness reducer to find products online.