Yesterday I received my Python Clean & Fill. Instructions are very clear and the hookup to my bathroom sink faucet was simple. Will try it out later today on my small 10 G tank. My question is, Why do the instructions state "Do not remove more than a third of the aquarium water at any one time" Seems odd as I perform weekly 50% WC on my 36G & 10gal using the bucket method using 4-5 drops of Prime per gallon and will perform similar 50% WC utilizing the Python, adding prime as I refill. Just out of curiosity,Is this "Important Warning" just an attempt to CYA from product liability? Or what logic can be applied to their "Important Warning Statement" feedback would be appreciated