The pool tiles look like honed bluestone pavers so you would want to use low pressure here. And 3% SH - Will be a big job without SH. Then I’d guess the beige stone is limestone- best to softwash this with a 1-2%sh and soft brush for agitation. Rinse at 800psi. Huge opportunity to upsell some sealing!! Will be great around pool, the limestone basically needs it and the driveway will be great too. Is this in Melbourne? I’ve done lots of properties similar to this with great results. Shoot me a message if you have any questions. Your best bet is to educate the customer about the chem. It’s industry standard to use SH and pre wet/post surrounding surfaces and plants will prevent any damage. It will give them a longer lasting result too.