Lyme disease is diagnosed clinically based on symptoms, objective physical findings (such as EM, facial palsy, or arthritis), or a history of possible exposure to infected ticks, as well as serological blood tests. The EM rash is not always a bull's eye, i.e., it can be solid red.
Rule of Thumb for Changing Filters. The rule we have followed for 18 years in the filtration industry is to change filters every 6 to 12 months. Six months is almost always optimum, especially in commercial/office settings, and twelve months is as long as you want to go no matter what.
How often should a Tetra Whisper filter cartridge be changed? It&#39;s only being used with a 5 gallon tank, only one beta fish in the tank. The instructions say every four weeks, but I didn&#39;t know if you might be able to get away with changing it less often or if four weeks is a good time span. Source(s): tetra whisper filter cartridge changed: https://bitly.im/Fdc2n.