How does Fernox Leak Sealer F4 work?

Fernox leak sealer F4 works by sealing any small weaps and leaks in the system. In this video Richard explains how to know if you need Fernox F4 and how it works...

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Fernox F4 Leak Sealer
https://www.plumbase.co.uk/fernox-f4-express-central-100010916-4008692
https://www.plumbase.co.uk/fernox-f4-central-heating-leak-100011441-3520403

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Видео How does Fernox Leak Sealer F4 work? канала Plumbase