i have ordered the tft-100 kit. i am slamming my pool with bleach to eliminate white water mold and using my pentair kit to monitor free cl and combined cl in the mean time. i am diluting sample by 50% to get the higher number. so far the process is working to clear the pool. i just added my third 1 gal bleach in three days last night, when my sons family called and wanted to swim the next day. what is the safe free and combined cl level for swimming? my cya is 50 and the water is clear. my check this morning is about 5to6 ppm free and about 9to10 ppm total. i am adding water after those checks. i could always see the bottom of the pool even before i started slamming for white water mold. it went from slightly turbid to crystal clear since i started slamming with bleach. i used to use stabilized tablets through a chlorinator and non chlorine persulfate to shock the pool until last summer when i had trouble keeping the free cl above 1 and my cya climbed to 120 and higher. i have fought white water mold for two summers before this year, partly because of over stabilized cl and i keep the pool covered with an automatic cover. my problems more resemble those from hot tub. in my original post i have lowered my cya to about 50 and cleared the slight turbidity with slamming with bleach. i stopped using tablets last summer and started using bleach. i also have used various polymers such as pink cure which have helped. my replacement water is well water which i filter using a hose filter and add chelators for staining etc. right now, thanks to your website, through slamming with good old bleach my pool is the clearest its been all year. my concern is carrying the chlorine that high for extended periods during the swim season. thanks for your help and continued assistance.