In days of old, I was taught that you needed to wait 3 days after the addition of HP before doing a PP treatment, in essence allowing the HP to burn off. With plenty of organics available for it to use in the burn off, I don't think you would need to worry about the HP after the 3 days. Dechlorinators were spent, as far as PP was concerned at 1 day, but if there is a large dose due to ammonia levels in the pond, then maybe wait. I would think you could treat with Hp within 2 days of using the Ultimate, and use the Ultimate within 3 days of using the HP with little or no interference by either.
Zone 7 A/B
Keep your words sweet. You never know when you may have to eat them.
Richard