Personally, I'm drifting, well no, MOVING rapidly toward a high CYA / high Cl approach to pool care. If it were just me, I'd use the trichlor up, use borax to compensate for pH drift, and use the Best Guess tables to adjust chlorine levels as CYA increased.

Oh, and you'll want to keep some chlorine in the pool over the winter, so the CYA doesn't get degraded.

But, this represents a change from my original approach on PoolSolutions, and I haven't worked it out with my moderators and others yet, and there are a bunch of pages to be revised. So, this is "UNOFFICIAL" advice.