That is not quite true. Many plastics leach phosphates because the plasticizers used to make them are Organophosphate Basedorganophosphate based. Remember, pure H2O is known as the Universal Solvent It's real easy to prove this to yourself if you have a colorimeter. Test some RO/DI water coming straight from the filter to ensure zero phosphate. Let it sit in the bucket or trash can of choice. Wait several hours. Use the colorimeter on the water in the bucket. You will have a reading of phosphates.