We do not stock the Q5540 filter. Email email@example.com
or call 1-888-801-7873 if you would like to special order the Q5540. An alternative option is the Q5640 filter below. The Q5640 is a 12" version of the Q5540 filter. The Q5640 has the same contaminant reduction as the Q5540. If you need a 10" filter, the Q5528 filter below is stocked and has the same contaminant reduction as the Q5540. The Q5528 carbon is GAC and not coconut carbon like the Q5540. All of these alternatives will fit in the filter head used by the Q5540.