Looking good! That Ahh-some really gets out the nasties that you don't even know are lurking in the plumbing. Looks like that aerator assembly was heavily insulated at the factory. Must have been a bit difficult to remove.
If the CH of your fill water is low, like the 90 ppm you measured earlier, don't worry about raising it up right away. CH doesn't matter much with fiberglass or vinyl surfaces so unless you experience excessive foaming after getting everything else in line chemically, I wouldn't worry about it.
If the CH of your fill water is low, like the 90 ppm you measured earlier, don't worry about raising it up right away. CH doesn't matter much with fiberglass or vinyl surfaces so unless you experience excessive foaming after getting everything else in line chemically, I wouldn't worry about it.