Thought this might be interesting to some.
Testing hardness with my nutrafin test kit. Test is in step of 20 for gH and 10 for kH.
gH kH
Tap 120ppm 80ppm
Rain 40ppm
Tank 100ppm 50ppm
Tank measurement is after 50%ish water change with rain water.
Miss my Nowra tap water that was 80/50 straight from the tank. Much easier to work with to get soft acidic water.
Steve