Thanks for this fantastic site! I have read through many posts on baqua conversion, but still don't know if I should change the sand. Previous owners had the sand changed every year because they used baqua. I am new to pools but have read extensively on TFP and feel very comfortable with the chemistry and basic skills thanks to all of you. I kept the pool open and running and let all the baqua dissipate (based on pool store measurement). In fact I waited too long and a January warm spell gave me an algae bloom. When I shocked the pool it turned brown for a few days and took a week to completely clear, but there was zero goo so I am thinking it was just algae instead of conversion colors. I have added bleach or calcium hypo to keep the chlorine level up and plan to install a SWG when the water warms. My TA, PH and CYA levels are all now within the guidelines on TFP. My pressure runs 19 psi on recirculate and 21 on filter when clean (just after backwash). I Back flush every couple of weeks when pressure gets up to 25 or when I need to drain due to rain. With my pressure not showing any signs of clogging and never seeing any goo, is there any compelling reason to change the sand? If so, can someone explain what I am missing? Is my thinking correct that a 2 psi difference in recirc and filter is normal?
Thanks again to all!