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Hi Timmy, really like the crossover into community helping out and benefiting, whilst recycling people's unwanted stuff! I was discussing with a group the other day was about building this idea into a tool like

Hi Paul
All comes down to trust on both sides - public need to trust app results are correct, and crowd sourcing needs to be trusted to work - we've all seen stories of wikipedia containing wrong info.

With regards to adding numbers on - when I first started out I listed these but nowadays it'll give no results if I did add them, unfortunately (as I quickly discovered) no one simply collects type 2, type 4 etc. plastic - same plastic but made/treated in different ways means that it needs recycling in different ways, so really the numbers don't mean much to people looking at how to recycle the product, much like most of the symbols on packaging.

Contamination - talking on a co-mingled side of things (what we have locally). My local recycling processing place (run by Viridor) says they aim for a 4% contamination rate and reckon that anything over 1.5% is due to people not putting right items in the right bin. Apparently they collect literally tonnes of scrap metal per week from bins that are only supposed to contain paper, plastic bottles, cans and glass - eg. they pull out things like chainsaws and hosepipes regularly, that's not just accidentally putting wrong things in!

I think it would be fairly easy to incorporate both ideas into one app and make it an even better tool. A lot of work to set up reward points system from scratch though. Maybe new thinking on making it easy for independent retailers (rather than big ones) to 'sign up' too. Maybe without having to sell it to them too much, make it generate QR codes that people can use at their tills for money off/promotions? They get free local advertising, app gets incentives for users.