If you email enquire@bristan.com with the type of shower mixer i.e. surface mounted or recessed, you can request the fitting instructions which they will email back to you. These include diagrams and instructions for changing, maintaining and cleaning the cartridge.
You can also ring them on 0870 442 5556.
I have always found them very prompt and very helpful.
Lewis
March 2008
Automatic Answer
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howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix baths and showers.