Which of these sponges be closest to a half inch?

If you’re talking about the hole in the middle, it is about a half inch.

Can the 0.8 intake sponge fit my topfin 40 filter

It should be ok for a 40 gph HOB They are a little big for my 10 gph HOB but i put two rubber bands on it and it stays put. And the intake for a 40 isnt much larger that the 10. So my guess is that it should fit about right without the rubber bands. But if not just take 2 hair rubber bands and put then in the sponge and it holds it on tight.

Is this a carbon filter?

This is not a carbon filter. This is a pre-filter sponge that goes over the inlet tube for HOB (hang on back) filter systems to prevent baby fish/shrimp from getting sucked up the tube and into the filter.

What is the ppi (porosity)?

I couldnt tell you how big the holes are in the sponges. But I can tell you that I use this spongs in a tank with Shrimp. I currently plenty if baby shrimp and I dont seem to have issues with the babies being pulled through the sponge and into the filter as I have a lot of them. So it is small enough holes to prevent small shrimp from going through it. But it does allow good flow as my filter flow is steady and doesnt seem to be slowed by it.

Aquaneat 6 Pack Pre Filter Sponge For Aquarium Shrimp Fry

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Description

🧽 Keep your tank crystal clear and your tiny swimmers safe — filtration made flawless!

BULK VALUE PACK - 6 sponges included to keep multiple tanks pristine or have replacements ready for uninterrupted filtration.
EXTENDED FILTER LIFE - Blocks debris and large particles, reducing clogging and prolonging pump and filter lifespan.
PRECISION FIT DESIGN - Elastic 0.8-1 inch inner diameter ensures a snug, secure fit on most aquarium filter intakes.
EFFORTLESS MAINTENANCE - Rinse and reuse sponges easily without losing shape or filtration efficiency.
ULTIMATE BABY FISH PROTECTOR - Prevents shrimp, snails & fry from filter suction, keeping your aquatic family safe.

The AQUANEAT 6-Pack Pre-Filter Sponge set offers a perfect fit for 0.8-1 inch aquarium filter intakes, providing mechanical and biological filtration that protects baby fish, shrimp, and snails from suction damage. These durable, reusable foam sponges trap debris and extend filter life, while their easy maintenance and bulk packaging make them an essential upgrade for any serious aquarium enthusiast.

Specifications

ASIN	B0B5KW55YX
ASIN	B0B5KW55YX
Best Sellers Rank	#2,728 in Pet Supplies ( See Top 100 in Pet Supplies ) #7 in Aquarium Filter Accessories
Brand Name	AQUANEAT
Customer Reviews	4.5 4.5 out of 5 stars (2,177)
Date First Available	July 1, 2022
Date First Available	July 1, 2022
Item Package Dimensions L x W x H	6.42 x 5.79 x 0.63 inches
Item Weight	1.06 ounces
Manufacturer	AQUANEAT
Manufacturer	AQUANEAT
Package Dimensions	6.42 x 5.79 x 0.63 inches; 1.06 ounces
Size	1.8"D X 3.2"H, 0.8"
Target Audience Keyword	Fish

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