I am going through the brown water battle right now with the same Intex pool you just bought. The filter the pool comes with is not strong enough to filter out the metals, at least in our situation. We put together a jury-rigged sump pump filter I learned about on this forum and it's working so definitnely read the other posts on this issue, there is lots of good stuff here! I also ordered the Intex sand pump, which is an upgrade option on this pool, from Amazon ($200) which is more than I wanted to spend but from what I've read (and experience) the pump the pool comes with just is not sufficient unless you have prefect water. It hasn't come yet so I cannot comment on how it will work.

Good luck!