PraziPro
Q & A w/Hikari.....
Q. The directions indicate it is ok to use after 3-5 days. Does
Prazipro disipate after 72hrs?
A. "It is intented for use for at least 3 days, this is the minimum amount of time we have found in our research to knock down an infestation of flukes or worms. For improved results let the treatment run for a longer period of time."
"...you can redose after 3 days (just make sure you do a large water change before dosing again) but I would suggest unless you have a severe issue to let the treatment run for 7 days, do the major water change and then redose. This will provide the more cost effective treatment."
Q. What's a large water change?
A. "a water change is required, the directions on the bottle clearly state to start with as large a water change as practical or start with new water. Our concern here is that the dying parasites will put toxins in to the water and the biggest risk to the other inhabitants are these toxins, the bio-load and the reduced oxygen level this process can cause. With a large water change we reduce the impact of this process in a big way. The risk is not the product, it's what is being eliminated in the closed environment."
Hope that helps

RA