Thank you for your response polyvue. No i havent tested it with a vitamin c tablet but thats a good idea. I spoke with a "pool guy" and he told me that the only way to bypass the cartridge is to remove the cartridge and run the filter without it. Im hestitant to do this as i don't want to ruin my filter or other equipment. Water looks clear to me and i did test the water and the ranges were pretty much normal. Thanks for your help. I hope chem geek sees this and helps me out. Id like to see if i cant shoot him/her or mbar a message but sadly enough i dont know how to do that either. Thanks for your reply. Much appreciate it.