I'm currently decorating a room and conscious of how much water it's taking to clean the paint out of a paint roller. At what point does the environmental cost of cleaning exceed the environmental cost of binning it and using a new one?
Details: I'm using water-based paint and painting walls. Using a 9" roller as a balance between speed and amount of paint left in roller. While more of the colour is going to be needed the next day I'm bagging up the roller rather than cleaning it; but now I've done with that colour. I'm UK based. It only makes sense to clean with clean tap water (I prefer to keep our limited stock of soft rainwater for other purposes and would not risk contamination of the pile with grit etc. as that would defeat the point). I'm soaking the roller for as long as feasible, rather than just running it under a tap. Roller is synthetic pile on a plastic cylinder.