Normally, we only deal with pool owners, not people doing service on them or friends.

But I can tell you this, and please don't take it wrong:

You're whole approach is wrong and test strips are utterly unreliable. I "cheat" and use test strips to give me a ball park idea of levels, but I don't rely on them. Every pool is a balance of measurments. There are recommended levels for when the pool is clean, and when the pool needs to be cleaned.

The Bromine measure you cited is only meaningful if you sanitize with bromine, instead of chlorine. The chlorine/bromine test on most kits assumes you are testing chlorine or bromine, because you cannot do both.

We also don't know what "very low" stabilizer means. 0-5ppm? 10ppm? 30ppm?

I suggest you start reading at our sister site poolsolutions.com and read the tips and techniques there if you want to help your friend. You (or your friend) WILL need a proper test kit---the Taylor K-2006 or K2006C, which is much less expensive than all the chems they are recommending. And do NOT add the algaecide they are recommending unless you want a big mess. The ONLY algaecide we recommend, and with caveats, is Polyquat 60%. If the only active ingredient is "Poly....<something long>.... 60%" and nothing else, that's the stuff. Anything else will do far more harm than good. Chlorine / bleachis the best algaecide in 99.99% of situations.

Basic pool care comes down to 3 things:

Chlorine levels based on stabilizer levels

pH levels

Stabilizer (CYA) levels matched to chlorine levels.

Everything else in ancilliary.

Good luck and happy reading!