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Our sealed heating system is 16 months old and was filled with Altech inhibitor when new. Since then, several valves and things have been replaced, so I'm worried that the inhibitor has become diluted. Is there a way to test it? I can find Altech inhibitor but not a test kit for it.

Our house (built 2013) has a non-opening uPVC window which has started leaking. Inspection outside revealed a big hole near the bottom, partially covered by a plastic strip (left). A neighbour's window has the same plastic strip but no hole is visible (right). Presumably the strip covers some...