Thanks to the uk.d-i-y archives, I've confirmed that my existing plumbing and water supply is suitable for the fitting of a Trevi Boost shower. I see that the equipment spec calls for check (non return?) valves to be fitted and I also remember reading that some people suggested pre-mixer sediment filters, though I couldn't find any specifics on these items. I live in a soft (and peaty) water area, so is it particularly helpful to fit some kind of in-line sediment filters, or would this just reduce flow without being of much benefit? TIA