I just add the start up dose and then supplement with the weekly dose.

With the pools I care for, I have to check combined chlorine every day - if I see it start to rise, I add a gallon of 12.5% and then add the suggested bi-weekly dose of poly a few hours later (having brushed the low circulation areas).

The other solution I had, before using the poly was to brush the low circ areas daily, while maintaining < 4 ppm fc limit max that law requires for commercial pools.