With no chlorine and no algaecide, you're probably on the edge of a bloom--if the algaecide you have is Polyquat 60, then I would go ahead and add it, leaving your filter on recirculate.
Regarding the sequestrant, I'm not really comfortable advising you whether or add more or not, or what the effect of the alk is, since this isn't really my area of experience. I do know that the more sequestrant you add, the more chlorine it's going to take to get up to baseline levels when you start raising it--but I'm not sure how much is enough. I've asked Marie to come take a look at this thread. Hopefully she will
be by soon and I'm sure that she can answer more fully for you.
I would think that the metal staining would show up fairly immediately. In the worst case, I guess you could always bring the chlorine up and deal with the stains if they show, but it's an expensive venture and I'd hate to put you through that unnecessarily.
I'm sorry I can't be more help, but I don't have any experience with metals, other than what I've learned from Marie!
Janet


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