In fairness to Jose, if there is crud (sediment, rust, whatever) in your cistern, it will inevitably be churned up when the water he brings is put in. We have used him MANY times over the years and have never had a rust issue. We have a very small cistern which won't even hold one of his full trucks, so we have him put the rest in the pool. We also had him bring several trucks of water last year after we had our pool resurfaced (knowing we'd never get it filled again if we waited for Corraplata to provide water!). The pool remained clear while the cistern water is mucky for a day or so until the crud settles again (we can see it all laying on the bottom when the water level is low). One of these days when the water is low again, we need to have the cistern cleaned out before he brings us water!