I don't always shock every week. With your usage it will do what's it's doing and keep your water clean and clear but have you ever tryed not doing it one week and doing it the next, every other week? If it works there is no reason to not do it. But it may not work with your usage and the only way you will know is to try it. I to use MPS for every other shock and with my usage I can go 2 or sometimes 3 weeks between shocks. But if I have a heavy bather load I will shock that week, it all depends, and there is nothing writen in stone, Once you learn your water and its needs based on your usage it will all fall into place. The important thing is to not over manage your water and it's needs will come to you through trial and error.