I started buying it and mixing it with my tap water. This only lasted a few months as I got tired of carting 25 litre cans of water around (my weekly water change is over 200l). So I bought my own unit. I don't know how much it costs but if your water is on a meter this could be a factor as most home units produce a lot of waste. I do remineralise one of my tanks. This is the product I use https://www.amazon.co.uk/dp/B06Y5QZBTL/?tag= its not the cheapest but I only need one product and the results are very consistent. I add one scoop for every 10 litres I change and this gives me dGH=6, dKH=3, pH=7. It also dissolves instantly with no residue or colour change.Yeah @essjay said you use 100% osmosis water. Did you buy your own RO filter or do you buy it somewhere? Is it expensive for to do waterchanges? My water is also very hard so maybe diluting it with RO water could help lower it or using RO and adding aquasafe to remineralize it a bit maybe?
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