@Cory So, I had another thread going with pond questions and chlorine, I'd like to condense it and add more info. I asked during the live stream on 5-2, and Cory mentioned the aerator on the indoor faucets (which made total sense)(also, ty very much) But I feel like he wasn't getting the whole picture, hence this long post. I recently set up a 125 gallon preformed pond. Each time I refill it the chlorine is out of control. I have dosed with Prime at each refill. Using my coop test strips, the outdoor water tests at 3.0 ppm chlorine, Prime says 5ml/50g, the first time I used 4 whole capfuls (16ml), even after 2 hours, water tested out at 3.0. Waited a few days, did another test, STILL 3.0, another water change and added 40 ml Prime, tested before and after the water change, still 3.0. Today after 2 weeks of not adding new water from the hose, I tested the water and it's down to 0.8 ppm. My city does not use chloromines to treat the water, so I've been super stumped as to why this stupid chlorine isn't going away. Should I be using a water conditioner meant for ponds? I do have a filter/fountain running all the time, so there is aeration happening. I use a python to water change/refill my aquariums in the house and the pond outside, so my indoor faucets have the aerator removed for they python. Which is also why I don't understand why so much chlorine outside vs inside? I test my tap about once a month, and my tanks weekly, the inside taps barely reach 0.8 chlorine, but the outside ones are always stupid high. And there are no water filters in the house, and I checked under the house, all the pipes are stemming from the main street source.