We have an Intex 15x48 vinyl above ground pool. We filled it with well water <— first problem. We learned we have alot of iron in our water. A few attempts at correcting ourselves with no luck so we headed to Leslie’s. They gave a list to work with beginning with metal out, cellulose and CU Later. Success! Clear blue water! Moved on to next steps water stayed clear/blue thru all this. Also maintaining the right numbers Finally got to add salt and shock. Back to brown water again? my guess is there was still trace amounts of metal in the water? Do I return to Metal out again? can I add stain remover at the same time?