Comments on this Polyfil fiber fill for my sump

So i noticed this at wally world tonight and i couldnt resist such a huge bag for $3 so i got it! Its hypoallergenic,washable and 100% from recycled materials ..has anybody ever used this stuff and would itbe ok in the sump?

Rust in Swimming Pool Water, p.4

What is polyester fiberfill? - POLYESTER STAPLE FIBER HOLLOW CONJUGATED FIBER

Fairfield The Original Poly-Fil, Premium Polyester Fiber Fill, Soft Pillow Stuffing, Stuffing for Stuffed Animals, Toys, Cloud Decorations, and More, Machine-Washable Poly-Fil Fiber Fill, 32-ounce Bag : Arts, Crafts & Sewing

Poly-Fil® Premium Polyester Fiber Fill by Fairfield™, 16 oz bag

Rust in Swimming Pool Water, p.4

Comments on this Polyfil fiber fill for my sump

The Original Poly-fil Brand Fiber Fill

7.2.1. Polyester Floss - AquaInfo

Is this filter too far gone? How often to replace? : r/Aquariums

What is polyester fiberfill? - POLYESTER STAPLE FIBER HOLLOW CONJUGATED FIBER