Rain water for water top ups

[criptic]

My tap water is very hard (over 20 degrees) . I'd like to soften it if possible. I've heard Almond leaves and rain water can be used to mix it a bit/ top up. Has anyone ever used these to actively soften the water more naturally?


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[Edvet]

Rain water works good. Except you have to make sure it is clean, so start to collect only after it has rained a while, like 30 mins or so, this way less chance of pollutants (either from the air or lying on a roof) in it. Reverse Osmosis is easier, but more expensive.
For a planted tank and almost all fishes you dont need soft water though.

 

[Ady34]

Heres a nice discussion on using rainwater
http://www.ukaps.org/forum/threads/rain-water-who-uses-it-in-their-tanks.22330/page-2