Filtering

One user is seeking cheaper sources after finding most options exceed kit prices. Another notes their own filters came in at low cost and worked fine when selected carefully, recommending individually wrapped ones as a reliable sign of quality while suggesting better options may exist elsewhere.

• Filters obtained so far have been inexpensive compared to kit costs
• Individual wrapping is a useful indicator when choosing
• Quality can vary so selective purchasing helps

Whether better quality sources than those already tried are readily available

Nothing here is advice.