If the filter becomes very dirty it can affect machine performance. It is easy to see the condition of the filter. Replace when it become discolored.

This filter may have an impact on the ability of any Auto Adjusting CPAP to accurately respond to airflow restrictions during use. If the average treatment pressure is below a pressure of 7cm H2O this should not be used.

We recommend that this product be used only by CPAP users who do not normally use a heated humidifier. Heated humidifiers can cause water to collect in the filter chamber, thus clogging the filter and adversely affecting therapy.

If a Whisper Cap is used on a M Series machine without a heated humidifier, it will not fit if used together with a outlet bacteria filter. If you wish to use both a Whisper Cap and a outlet bacteria filter without a heated humidifier, then you should add a Hose Quick Connect or a M Series Tubing Swivel between the cpap machine and the outlet bacteria filter.

As always, just call if you have any questions.