Where there are problems, there are solutions. Fit a RO filter filter, get a pumped one so you don’t lose too much head pressure, solar powered of course!Yep. I just let nature do its thing (washing with tap water is supposed to be bad for people in hard water areas like us)
But must admit it’s tempting to try to get some dust etc off.
I expect this is getting beyond wife approval but where there is a will there is a way
They are a combined PV and thermal panel, you’d need to run them with glycol and people use them to heat pools etc.You can get the panels that absorb the heat as well. I've seen them in Canada but not sure if they are available (mainstream) in the UK.
They use a antifreeze type coolant and heatpump to transfer the heat from the panels.
That said I couldn’t see any reason as to why you couldn’t also plum them inline with a heat pump to boost the temperature for home heating in the winter and water heating year round.
You’d probably want to use a heat exchanger rather than having the two directly mix though. Glycol reduces the heat carrying capacity of water so it’s avoided in heat pumps because it reduces efficiency and anti freeze dump valves are preferred.
You’d probably need another solution to dump the heat in the summer as there is only so much hot water you’ll need. Hot tub? DIY pool?