I am feeding my pool with a Pulsafeeder Mec-O-Matic VSP 20 Variable Speed Peristaltic Metering Pump (Chlorinator) using 6% ultra bleach. The unit is almost new and seems to be operating fine. I have monitored usage by marking levels in reservoir and setting pump speed and timer to same settings for a couple of weeks. Usage is consistent. My FC is flucuating more than I think it should. The only variable that I have not controlled closely is the mixture in the reservoir tank. I think this is the weak link. Is there a reccomended dilution rate or minimum strength that should be maintained for this solution in the reservoir? I run the chlorinator pump from 2 am - 6am everyday and when I test water in the morning at 9am everyday the FC is 3 - 4 ppm however by days end it is often .5 - 1.5 My numbers are listed below. Please advise.
FC 3 - ppm