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Message: [QUOTE="ralphjramirez, post: 174676, member: 5622"] Hi Howard. Unfortunately the Laguna Pressure-Flo 700 UVC is not a biological filter. When I first ordered it I thought it was but there was conflicting info on the manual, in one part of the instructions it indicated there was no biological media in the 2500 but later on it indicated the 700 and 2500. I was disappointed but did nothiing more than call them and advise them of the error in the manual. I have used AlgaeFix many times before and using the dosage I apply it has never raised the ammonia and nitrates but I admit I haven't checked it for quite some time. I will do as you suggest and check just to make sure. Thanks again Howard...............Ralph [/QUOTE]