Actually, Janet, in my experience, clear green is soluble iron. Copper can be a bluish green, but usually the coloration is not strong enough to be distinct.

Phenom, using HEDP (that's the short name for the chemical) will keep the soluble iron in a very soluble state . . . but only temporarily. However, it's difficult to REMOVE the iron, while it's chelated by the HEDP. There are four ways to actually REMOVE the iron that I know of:

1. You can trap it on the filter, in a state that can be removed. You'll have to clean your filter regularly, to accomplish this -- if you trap it, and then leave it, you'll tend to keep redissolving some of it. If you happen to have access to solid pieces of calcium hypochlorite -- like Pulsar tabs -- keeping one or two of those in your skimmer will definitely help.

2. You can use alum or polyaluminum chloride to trap it, and then settle it to the bottom OR catch it on the filter.

3. You can do a high pH lime softening precipitation of the iron, using washing soda to push your pH very high, temporarily, and settling the iron as ferric hydroxide.

4. You can use the "CuLater" patented zeolite-like product. We're not 100% sure this works, but we think it does. AND, it's the only method that will possibly remove the iron while it's still chelated by the HEPD.

Right now, you should be OK. The HEDP will last at least a week or so, unless you push the chlorine very high. So think about it and post your test results when you get the K2006. I'll edit this post of mine, to add Amazon links to some of the products, you might use, so you can look at those.