16" Qty of 21+ = $3.28 each
32" Qty of 21+ = $4.33 each
Internal plastic ring
Diameter is ~7"
Thier is no mixing so we can order both but Qty must be 21 each. I prefer the 25 micro it catchs a lot more, and almost eliminates the micro bumbles. But you do have to change them every day, verses every other day with the 100 microns JMO
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