F7 is compatible with all common system materials, including aluminium, and can be used in conjunction with Fernox inhibitors and leak sealers.One 200 ml bottle treats up to 100 litres of system water.
Used for my underfloor heating and boiler/cylinder circuits. Seems to work well as no sign of jelly-like deposits and both circuits drain clean. As with most chemicals these days though, it's becoming more expensive, especially as annual replacement is recommended.