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.

6 Pack Pre Filter Sponge For Aquarium Shrimp Fry Fish

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R286

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Keep your tiny swimmers safe and your tank sparkling—because your aquarium deserves the best!

VALUE PACKED 6 PACK - Six sponges included to cover multiple filters or future replacements—never run out of protection.
DURABLE ECO FRIENDLY - High-quality foam withstands repeated rinsing without losing shape or performance.
PRECISION FIT FOR YOUR FILTER - Elastic 0.8-1 inch intake hole ensures a snug, secure fit—no slip, no stress.
CLEANER TANK LONGER INTERVALS - Captures flakes, plants, and debris to keep your aquarium pristine and reduce cleaning frequency.
ULTIMATE FRY SHRIMP GUARDIAN - Prevents baby fish, shrimp, and snails from being sucked into filters, safeguarding your aquatic family.

The AQUANEAT 6-Pack Pre-Filter Sponge is designed to fit filter intakes between 0.8 and 1 inch, providing a protective barrier that prevents shrimp, fry, and snails from being sucked into aquarium filters. Made from durable foam, these reusable sponges trap debris and fish food, improving water quality and extending cleaning intervals. Each pack includes six sponges that expand to their full size after unpacking, offering excellent value and reliable filtration support for freshwater tanks.

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R286

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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6-Pack Pre-Filter Sponge for Aquarium Shrimp Fry Fish Tank Filter 0.8” Intake, Replacement Foam Cover

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