IMHO, if your system has a manufacturers name, Nova, Pelican, Boss, Sears, etc., come to mind, I would start with the local vendor for that brand. I am familiar with Sears, and there is virtually no maintenance for the life of the unit, unless dirt or sand gets into the metering orifice. Other systems, one or more filters, and need to have one or more replaced at specific intervals. If you post your specific make/model, I am sure there will be others that will be able to give you specific advice.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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