I have been going to the Waingaro hotpools for a couple of years now and I have never seen the pools dirty, yes after a lot of rain they might get a greenish colour but this is a reaction with the water as it is from a thermal spring. I know that the pools get cleaned every day so anybody claiming that they are dirty probably need new glasses.
Yes, there are some insects and sometime leaves floating in the water but they are open air pools so get over it.
After reading most of the comments on this site I can only come to to the conclusion that a lot of the comments are written by people whom have never been here and just jumped on the bandwagon for some Anonymous pool bashing.(Its interesting that all negative comments are made by people who give only there first name.)
My personal experiance at the pools has always good.
And as for the price $11.00 for an adult, try to find an other place where you can have a whole day of fun for that money.
P.S. a personal message to James from Auckland : Get a hobby.