Could a Trident UV light installed cause a rapid reduction in free chlorine? It seems reasonable given the suns UV light affects on chlorine. As fast I add chlorine it rapidly degrades to zero.FC:0 to.25 CC:0 PH: 7.4 CYA:45 TA: 110 CH: 240 water quality: great clear. Issue can not maintain FC level over any amount of time period (> 3-4 hrs) no matter how many SLAMs and from a cost perspective water replace would be more cost efficient. But is real problem the UV light? It makes sense.