Pressure washing area around pool and pool deck?

I would do my best to limit how much gets in the pool. The grit and sediment will be hard on your filters. Any chemical that has phosphate might cause a algae bloom, and I wouldn't want to be swimming in a lot of those chemicals.

A properly designed pool deck will channel water away from the pool itself, and drain it properly. So, you should be able to start at the edge of the pool and work your way out from the pool without getting too much in the pool. Hopefully, you have a drain that you can push the water towards. You might want to have a second person with a broom pushing the water into the drain. Otherwise, you'll probably have to do it in sections and let any puddles soak into the ground before continuing.

The other option, if the pool needs it, is to drain the pool and clean everything at once.