Fernox 231159 62234 F1 Filter Fluid Plus Protector, Clear, 500 ml

Works with a filter to protect the system Against corrosion debris Suitable for boilers or water heaters Designed to be easy to use Designed to be left in the system permanently Prevents scale and corrosion formation, Weight: 1.3007273458 pounds, Manufacturer: COOKSON ELECTRONICS (FERNOX)