I still do monthly. Not sure if the clear pond was a verified alternative. I paid $35 for a bottle maybe 3 yrs ago, and it's at about half full so I wouldn't be focused on price since $35 in GFO gets used up in about 6 months....
I just ordered some on Amazon and will try it out in small doses along with my GFO. I've been having a heck of a time getting phosphates under control lately.
ya I have some 50 micron bulk material I cut up (I call them my fish diapers) and a home-made filter box contraption that I will be using. I will report back after I try it out.