I would always say a tap water conditioner is vital when using mains water. Sure Chlorine is a gas will dissapate into the atmosphere. Cloromines (another time of disinfectant), however, do not. A condiditioner sorts that out though. And heavy metals too.
Emma -we always used one when the children had fish tanks but never thought of using it in the pond as we didn't have fish in it! The ponds at my last house were spring fed so they had constant running water through them. Would you recommend that and what long term effects would there be to fish/wildlife if you don't?
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
FG, tap water promotes algae growth as it tends to have high levels of nutrients. Chloramine contains ammonia and chlorine, which is toxic to any animals/fish/insects living in it Natural springs get a big thumbs up from me
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I work in aquatics
I would always say a tap water conditioner is vital when using mains water. Sure Chlorine is a gas will dissapate into the atmosphere. Cloromines (another time of disinfectant), however, do not. A condiditioner sorts that out though. And heavy metals too.
Emma -we always used one when the children had fish tanks but never thought of using it in the pond as we didn't have fish in it! The ponds at my last house were spring fed so they had constant running water through them. Would you recommend that and what long term effects would there be to fish/wildlife if you don't?
I live in west central Scotland - not where that photo is...
FG, tap water promotes algae growth as it tends to have high levels of nutrients. Chloramine contains ammonia and chlorine, which is toxic to any animals/fish/insects living in it
Natural springs get a big thumbs up from me 
Just topped up my koi pond with tap water. I have no problem with algae. Regularly testing water is a must in this hot weather.