a small frequent water change or large monthly water change would be fine. but since you are asking how could you eliminate the possible accumulation of chloride in the tank due to dosing of diy 2 part additives, IMHO, it's much better to do a frequent at least 10 t0 20% weekly wc to breakdown the chloride present in you tank than 10% monthly wc. for example if you have 100 gal volume system, and do a wc of 20%/weekly , after a month you will have a 59% new water(
http://www.hamzasreef.com/Contents/Calc ... Change.php. ) assuming that we have 20ppm of chloride present in the tank, we can safely assumed that the 59% of 20ppm which is more or less 11ppm was exported through 20 weekly wc in a month, than 2ppm of chloride exported through 10% wc/month.HTH