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I have tried unblocking my

I have tried unblocking my external drain, blocked by grease, by pouring boiling water with sea salt it melted the grease straight away and i collected all the grease that came to the service with a sieve i then used a rod to ensure the chamber was clear and then cleaned all more hot water and then cold water saved me about £! When a boiler providing domestic hot water for a district heating system on a military base just stopped working... Boilers are notoriously inefficient.

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