My pool is now 1 year old. I recall the pool builder saying that I should change out the first filter after about 1.5 years, after that it should last about 3 years. I clean out my Pentair Clean & Clear 150 at least every 2 weeks. It is an open deck pool and the neighbors have big oak trees, so it sees plenty of leaves, pollen and other debris. I never see any problems with pressure building because I clean it frequently. Pollen has been a big problem recently and I have been battling a buildup of pollen. I have been vacuuming and brushing the pool and cleaning the filter frequently to catch up and keep the pool surface and water looking clean and clear. I have done several overnight chlorine loss tests to confirm their is no problem with algae...zero overnight chlorine loss. So my questions, should I be looking to replace the filter soon with all the work it has been doing in this first year? Or, what is the clear cut way to determine when it is time to change it out? By the way, I finally ordered a robot cleaner. Should have it early next week.