Sanitising water and tanks 2013 Dorset

Hello, can someone tell me how to sanitise the water and tanks please.
In a previous Elddis motorhome I used PuriSol and AquaSol and put it in a watering can then into the water filler hole on the van.  My Dorset had a completely different filling system whereby the hose is clipped on or I can use a submersible pump and fill via a bucket with Pursol in. There must be an easier way to do this?
Jules

No easier way unless you go to the expense of having a hole in wall filler installed. Many people have done that . Even AS put both types of filler on later vans.

Paulmold wrote:No easier way unless you go to the expense of having a hole in wall filler installed. Many people have done that . Even AS put both types of filler on later vans.

Thank you Paul, guess it’s bucket and submersible then for PuriSol then use mains hose to fill up.