Its been one day since I added the kieselsol and it was time to add the Chitosan to clear the liquid. The demijohn was starting to clear after 24 hours, with the liquid a grey colour and black sediment at the bottom.
The chitosan comes in a packet and you just add it to the demijohn and gently shake it for 20 seconds. Nothing happened but now I need to leave it for 3 days . Will see what happens!