Here still thinking if i should/want to use and buy a RO unit.
Currently using rain water as a test to see if it works good(just for the plants etc).
Also running CO2, plant ferts, high light etc.
What i noticed was that plants like rotala green did better compared like before.
Tap water here has (via water company site):
dH:
8,67 - 10,71
pH:
7,75 - 7,89
So for now, yes it works great but i am depending on the weather/rain. Also it works because, well, we had more rain compared to the last 3 years
But during the summer.......... The rain barrel will be more empty than full i am afraid.
Also using a 200L barrel on the attic which i have filled with rain water for use now (great fun to get it to the attic with jerrycans.......).
But also as a test to see if i will get/use a RO unit (which will be located on the attic) how it will work with a hose/tube back to the aquarium 2 floors down.
This test works. Simple 15/18 (more flexible) tube with a eheim tap on the end. gravity will do the rest.
Downside with use of a RO unit will be the water waste (and extra security needs to build in to prevent overflows etc. Dont want a 2 floor waterfall in my house..... )
So i am still doubting if i really need it for a high tech aquarium (current aquarium will soon be replaced/upgraded with an ADA 120P)
Looking at the aquariums like green aqua etc is using with TDS ratings around 120ppm is nice. But still........ Do i need to through away "waste water" for this...........