🐠 Fluval-Compatible Replacement Foam Filters 4-Pack - Compatible with 304 / 305/ 306 / 404 / 405 / 406 Aquarium Canister Filter Models - Bio-Foam A237 Equivalent - Made in the USA By Impresa Products Review

Have used these in a 2 turtle Fluval filter for the last 2 months on about 50 gallons of water and the water is still very clean and healthy!

They fit perfectly but aren't as tight as Fluval OEM. And this is the main filter, so you need it to work properly. Otherwise the filter will not clean the water.

I use them in both aquariums and turtle tanks. I only have to change it in the aquarium once a month and the turtle needs a weekly cleaning. The price is quite reasonable, you can simply exchange if necessary.

I recently had to replace a physical filter with a Fluval Flex, I searched for a replacement and found this one. They are cheaper and fit my Fluval well. I can't say much about the filters yet as I've only used them once.

Foam filters fit in canister but are too tall when charcoal bags are added and foam filter needs to be trimmed. Overall I can't give a thumbs up or thumbs down at the moment as I only changed the filters last weekend so remains to be seen how effective they are.

It seems like OEM. The only difference is in the packaging. Another reviewer said they were uncircumcised etc. This is not the case with the ones I bought (multiple purchases). If you look through the shrink wrap they appear to be a solid block of foam, but after you remove the wrap they are individual blocks of foam cut from egg crates just like the OEM.