The top 2-3ft of pond water is close to 1/2 the total volume. Hopefully the Soilfloc will reduce most of the leakage and water loss will be due mostly to evaporation. Chlorinated water creates numerous trihalomethanes ((chloroform, bromoform, bromodichloromethane, and dibromochloromethane) especially when it come in contact with associated in surface or natural waters. Trihalomethanes (THMs) are the result of a reaction between the chlorine used for disinfecting tap water and react with natural organic matter in the water. The more organics and chlorine in the water the more trihalomethanes that are formed. Trihalomehanes are stable in the environment, are bioacumulative, and can become a health related problem when lots of them are formed. Read about problems with trihalomethane on the web. One option is to first pump the water into an upground swimming pool allow the chlorine to dissipate then add it to the pond. The other option that I like is to dig some sort of well and use that water for pond filling. Lots of pond owners use well water to keep ponds full.
An interesting read:
https://www.cdc.gov/biomonitoring/THM-DBP_BiomonitoringSummary.html
