What's a good product to use the smaller ones with? Amazon sell anything good?

You question makes no sense at all.

If needed, can these be cut to fit a specific size of funnel? Or would I be better off just buying some of the square filters and cutting those?

Buy the correct size for your Buckner funnel; if you are using a gravity funnel, look up how to fold round filter paper for this type filter.

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🔍 Elevate Your Lab Game with Whatman Filter Paper!

GRADE 1 QUALITY ASSURANCE - Ensures reliable results in qualitative analytical separations.
HIGH FLOW RATE EFFICIENCY - Streamlines your processes with a rapid flow rate for optimal performance.
BULK PACK FOR CONTINUOUS USE - Pack of 100 ensures you’re always prepared for your next experiment.
VERSATILE LABORATORY ESSENTIAL - Perfect for a multitude of applications, from food safety to environmental monitoring.
EDUCATIONAL TOOL FOR FUTURE INNOVATORS - Ideal for teaching and demonstrating fundamental laboratory techniques.

Whatman 1001-042 Quantitative Filter Paper Circles are designed for precision and versatility in laboratory settings. With a diameter of 42.5mm and a flow rate of 10.5 seconds per 100mL per square inch, these Grade 1 filter papers are perfect for clarifying liquids across various industries, including food, agriculture, and environmental monitoring. Ideal for educational purposes, they facilitate effective teaching of qualitative analytical separations.

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