I have used too much di- & tri- chemicals and am afraid my CYA is going to be too high. I read a post on using aeration to lower CYA but have not been able to find it since. I have a 20K gal inground with a fountain running off 1/2" PVC from filter. I have three returns and can rig them to run as fountains if necessary. I have a f-100 test kit ordered and, at this time do not know, the concentration of CYA. Any help is appreciated.