I moved and need to get an updated water test from Ward Labs. I noticed they offer a household mineral test and a home brewer's test. The only difference is that they don't test for Iron and Phosphorus in the household test. Is this important or am I okay saving $7 and not getting that? I have Memphis city water which they publish the report for online, but it is outdated from last year. I don't see the Iron and Phosphorus being an issue..