Hi GM;
Your choice.
If it was me, and the water cost wasn't a problem, I'd just drain and refill. Like you say, it's 90 (9-fleeping-4 here right now, and climbing on June 5th, for crying out loud!). That's going to be the fastest way (if you can drain and fill reasonably quickly) to get your pool running. Plus, pressure washing the pool quickly will clean those algae stains. Just remember to keep the 'goo' stirred up, as you drain, so you don't end up with a foot of un-pump-able sludge at the end.
Do NOT pressure wash the cartridge; use an ordinary hose with an ordinary sprayer to clean the cartridge. Dunno that there's any certain "life" - depends on the cartridge, use, and how you've cleaned.
Ben
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