Well water?

[Watermom]

You will probably have to have a pool store run a metals test on a sample of your well water for you. But, do NOT let them talk you into buying anything until you run it past us here first. Use this time to do a bunch of reading and go ahead and get a kit ordered.

EDIT --- I just found a different thread where Ben gave these suggestions for testing well water for iron and manganese.

#1 - Find out if your water has iron or manganese in it. One way is to cut the top off a milk jug, clean it, fill it with well water, add a teaspoon of baking soda, and a teaspoon of bleach, mix . . . and then let it sit overnight. Looking at the water the next morning (or the gunk on the bottom of the jug should give you a clue.

BE SURE TO USE THE WATER YOU WILL FILL WITH! If you have a softener for the house, but will fill the pool with unsoftened water, you need to sample unsoftened water. (A softener removed iron and manganese before it removes calcium.) If you do plan to use softened water, find out what your unit's "break-through" point is, and plan to regenerate often during filling.