 - Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow Filmtec recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. We DO NOT mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior. All items are sold as is and there is no implied warranty. It is your responsibility to assure the items are compatible to your needs and other.