can the pellets be sifted from the media? and reused?

Since they float I usually put the batch in a big container of water and scoop them with a sieve. I reuse them only with the same stage or earlier to make sure I don't contaminate a finer stage. I keep them in labeled bags as well again to make sure there are no problems.

How many beads do you use with 3 pounds of rocks, also which stage do use them with, 1, 2, 3 and or 4?

Just enough to fill the drum to 3/4 full, rocks and beads. Sometimes I use them on stages 2 3and4.

Would this polish for Aluminium objects well?

The pellets don't actually polish but work as an aid when tumbling with the polishing medium.

Can this be reused multiple times, or does it break down pretty quickly? Would like to use it for filler with mixed rocks in my rock tumbler.

I have successfully reutilized Poly Pellets numerous times. I Make sure to rinse them really well and let them Dry before storing them in a plastic jar marked for that step of tumbling and only reuse the pellets in the same step. Your rock results come out better that way and the pellets seem to hold up longer. Of course the more abrasive the step, the less longer the pellets last. As I rotate my pellets up a step as they begin to shrink in size from use, I always save my new pellets for the fourth and of fifth (burnishing) steps. Hope this helps.

Product Dimensions	19.81 x 10.67 x 16.51 cm; 453.59 g
Manufacturer recommended age	3 years and up
Item model number	683405247050
Educational Objective(s)	STEM
Language:	English
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Polypropylene
Color	black
ASIN	B01N1671ZC

Polly Plastics propylene Pellets Rock Tumbling Media. 1 Lb. Rock Tumbler Filler Beads in Heavy Duty Resealable Bag.

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