Nov 6, 2005
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Equally, the black bits could well be algae - all caravan systems need purging with Puriclean, or similar, every year or 30 days use - you'll need to be able to run the system with the filter removed to do this.
 
Jan 20, 2008
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Had similar from on board tank in my trecker .

in my work outfit which is a ship and my caravan we regularly use a solution of milton,keep well flushed and a weak mixture. keeps things healthy and no chance of the trots
 

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