Water Tanks, page-116

Never had a fast flowing creek flowing off my roof.
"Sorry to dampen your day", but the sediment trap does work and exactly as I described, as I have done the experiments that I have described. It works in drizzle to 60mm in an hour to date.
If you want to keep paying for filters that are not necessary then go for it.
I'm still trying to work out how your horizontal down pipes work........
If you are going to continue to argue about something you have never experienced and are not willing to try and understand it, its over and out from me.