A wallet, a $20 note, fast food outlet toys, a baseball, a tennis ball - you name it and it is likely to have turned up at the Hastings' Wastewater Treatment Plant in Clive.
Treatment plant manager Bob McWilliams has been at the plant for 26 years, and has seen it all. That makes him the perfect person to host an open day at the plant on November 11.
Between 35,000 and 70,000cu m of mostly liquid matter goes through the treatment plant every day.
There are larger flows during the height of the horticultural season, from February through to April.
Open day visitors will see the initial screening process, which takes out solids larger than 3mm, the pumping process, video of the way the trickling filters work, and samples of the treated wastewater.