We have had our hot tub running perfectly for a month with crystal clear water (levels all good) we have put one of your filters in and the water has turned cloudy within hours , can you tell me why this has happened and what do you suggest we do to rectify?
Nothing on the filter itself would cause cloudiness. Cloudiness can be caused by mutiple things. The best place to find solutions for cloudy water would be in our article here -
How long do paper hot tub filter cartridges last?
Up to 2 years if they are cleaned regularly with a filter cleaner solution.