is'nt there a chance of contamination from bugs etc

Well, I notice RichH is recommending filtering but we don't think it worth
the effort, provided you clean the deck properly.

Having said that, tanks/pipes can get mould (or whatever) in them over
time. Not really sure why, Peggy can probably tell us. Therefore roughly
every six months to a year, when there is free unmetered water available,
we empty the tanks, give them the bleach treatment Peggy has talked about
and refill them.

Mike