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Just tested my rain water, assume yours would be similar so hope this helps.
KH 70ppm
GH 125ppm
PH 7.0
Tap water (Britta filtered)
KH 215ppm
GH Off the chart!
PH 6.6!?
So it looks like using a Britta was a complete waste of time, aside from dropping the PH. Straight out of the tap it's...
I was going to but worried about pollution. I'd use the prefilter above and possibly run a UV filter for a bit before adding to the tank. I have a water butt and it's absolutely full of bloodworms (or similar) so unsure how clean it is.
Because my tank is only 30L I'm just running tap water...
I've grown up with it so don't really notice the taste so much. It's not exactly the best however and showers are far more enjoyable with softer water.
I've kept a planted tank without problems with pure London water. I know use filtered rainwater.
One of the reasons I've always avoided installing an RO system. As a slight aside, one of the benefits for me to the walstad/low tech approach is the low energy usage compared to high tech set ups. I simply don't feel comfortable wasting such amounts of energy on a hobby, nor large amounts of water.
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