FWC - How much, how often ?
Gail,
I’m not so sure that removing things like minerals and buffers is necessarily a good thing. Chlorine, Chloramine and Heavy Metals is fine to filter out but if the filter does too good of a job, then the water is more likely to suffer from too low of hardness and pH especially once the pond’s ecology starts utilizing even more of the minerals, calcium carbonate, etc. Too low of a KH can result in a pH crash.
That whitish ring is just various minerals, calcium carbonate (KH level), etc., left over from evaporation but those things are definitely needed to support the overall ecology of a tank or pond. Fish, etc., cannot live on super filtered water like RO water without adding the essential minerals, etc. that come through many water supplies.
Does your filter list what it filters out and doesn’t filter out?
Lenny Vasbinder Fish Blog - http://GoldLenny.blogspot.com
Category: Philippines Internet Koi Society
