Would you be able to use this as a prefilter pad in a cat water fountain

It depends on the fountain I guess. This stuff is real thin, less than a quarter inch thick. For your application, I'd use filter floss to build up to proper thickness, then the micron polishing pad. The combination should do the trick, plus you'll be able to make a ton of filters. https://www.amazon.com/Blue-Ribbon-Products-ABLPLY4-Polyester/dp/B0002AT7GQ/ref=sr_1_8?ie=UTF8&qid=1534194152&sr=8-8&keywords=filter+floss

Will this help with micro bubbles coming from my return pump?

Our polishing pad is designed to trap fine particles from the water. It is probably not your best choice, but I am not sure how you were planning on using it. Either our Premium Dual Density filter pad or an aquarium sponge may work better. - Lexi M at Aquatic Experts

explain micron ? 50 vs 100 etc

Our 50 micron polishing has a smaller pore size and will trap finer debris than our 100 micron. - Lexi M at Aquatic Experts

Where would i place the pad and what direction in a grech cbg-800 5w uv sterilizer hang-on back filter, 20-50 gallon/211 gph, black ?

I always have the polishing pad as the last pad before the water returns to the aquarium

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Aquatic Experts Aquarium Polishing Filter Pad, Water Polishing Pad for Aquarium Filters, Filter Floss for Fish Tank Filters, (100 Micron, 24" x 36" - 1 Pack)

Product ID: 323486492

Details

Brand
Aquatic
Item form
Pad
Manufacturer
Aquatic
Number of Packs
1
Unit count
1 Count

💧100 micron ultra-fine filtration

♻️machine washable durability

✂️custom cut-to-fit size

Description

💧 Elevate your aquarium game with sparkling clarity that demands attention!

BUILT TO LAST REUSE - Durable polyester fibers withstand machine washing for long-term use.
VERSATILE FILTRATION POWER - Perfect for wet/dry filters, sumps, and aquaponics systems—adaptable to your setup.
LAYER UP FOR ULTIMATE CLEAN - Combine with other filter pads to extend cleaning cycles and boost water quality.
CRYSTAL CLEAR AQUARIUM WATER - Traps ultra-fine particles down to 100 microns for pristine clarity.
TAILORED FIT MAXIMUM SAVINGS - Cut the 24" x 36" pad to your exact filter size—no waste, no extra cost.

The Aquatic Experts Aquarium Polishing Filter Pad is a 100 micron, 24" x 36" polyester pad designed to trap fine and extra-fine particles, delivering crystal-clear water. Its customizable size and durable, machine-washable construction make it a cost-effective, versatile filtration solution compatible with various aquarium systems.

Specifications

ASIN	B014G7WTRY
Batteries Included	No
Best Sellers Rank	#28,034 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,720 in Aquarium Accessories
Care instructions	Cut aquarium filter pad to size. Rinse pad in clean water and place in filter
Color	MULTI
Compatible Devices	Compatible with Aquatic Experts Carbon Filter Pad, Compatible with Aquatic Experts FilterFirst filter pad
Customer Reviews	4.6 4.6 out of 5 stars (3,513)
Date First Available	16 June 2016
Fill Material	Polyester
Item Form	Pad
Item Weight	207 g
Item model number	FBA_Aqu-2117
Number of Items	1
Pet Life Stage	For all ages
Pet Type	Amphibian, Fish and Aquatic, Reptile
Product Dimensions	60.96 x 91.44 x 0.33 cm; 207 g
Quantity	1
Size	100 Micron - 1 pack
Specific Uses	Behavior
batteries required	No

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