Marineland Bio-Wheel Emperor 400 Aquarium Power Filter


4.3
Rated 4.3 out of 5 stars
203 Ratings

159 Customer Reviews



Rated 1 out of 5 stars
By John on Nov 17, 2025

Pure junk

Save your money. These filters are pure garbage. They always loose a prime. I had to contact Spectrum and they shipped me a new one. A month later and the same

Save your money. These filters are pure garbage. They always loose a prime. I had to contact Spectrum and they shipped me a new one. A month later and the same problem. I contacted Spectrum again and the speak to you like a 3 year old. I been in the fish hobby for over 15 years never seen such a crappy filter. The are also expensive to run. Do yourself a favor and get an aquaclear 110. You will save money in the long run. Tust me.


Rated 5 out of 5 stars
By Michelle on Jan 25, 2025

Filtering Capacity, Water clarity

I have owned Marineland Bio-wheel filters for many years and in different sizes as I own many aquarium sizes. I used the Emperor 400 on my 33 gallon tank. ( I have

I have owned Marineland Bio-wheel filters for many years and in different sizes as I own many aquarium sizes. I used the Emperor 400 on my 33 gallon tank. ( I have owned 2 of this size now this is my third one). I have only had one unit that is "fickle" about running as it should which I believe has something to do with the impellor which I have replaced and seems to have fixed the issue of the water not continually flowing through the sprayer bars. This has been my ONLY downside of the Emperor 400. You can see I have purchased another one as my backup. The timing was right with Chewey's pricing as well to get a back up for the future "Just in case". I know not all people like the same items but, THIS is a Favorite Filter system for me.


Rated 5 out of 5 stars
By Pamela on Mar 29, 2025

prices are excellent

this entire order was the best price anywhere for these things. these items are from great manufacturers i have trusted for 25 years, and these prices are the best

this entire order was the best price anywhere for these things. these items are from great manufacturers i have trusted for 25 years, and these prices are the best for the brands i want for my pets!


Rated 4 out of 5 stars
By zyra on May 29, 2025

Excellent Product

Easy to set up although wished the filter was able to self-prime.

Easy to set up although wished the filter was able to self-prime.


Rated 3 out of 5 stars
By Kerri on Dec 24, 2024

What is going on?

This is the 2nd or 3 rd filter of the same kind and brand that I’ve gotten for the same tank. These filters used to be adjustable and last forever. Now, I don’t

This is the 2nd or 3 rd filter of the same kind and brand that I’ve gotten for the same tank. These filters used to be adjustable and last forever. Now, I don’t know if it’s a different design or impeller but they sure don’t last like they used too!


Rated 2 out of 5 stars
By Jeremy on Sep 15, 2024

In the past, these were better made, and quieter.

I returned this due to the noise. It was very loud. I also noticed that the plastic is very thin. In the past, the plastic was much thicker, there were windows

I returned this due to the noise. It was very loud. I also noticed that the plastic is very thin. In the past, the plastic was much thicker, there were windows to view the bio wheels, actually turning, and they were much more quiet. After returning this model I purchased a marine land Emperor 450 Pro model. It is much better made. It is also decently quiet. I would highly recommend spending a little bit more money and getting the 450 pro version.


Rated 5 out of 5 stars
By Tim on Oct 8, 2024

Good filter

I own 2 penguin filters that are 25 years old and have been great. I wanted to upgrade and was hesitant to buy marineland again because of negative reviews, but

I own 2 penguin filters that are 25 years old and have been great. I wanted to upgrade and was hesitant to buy marineland again because of negative reviews, but so far this filter is of good quality... I would recommend it.


Rated 5 out of 5 stars
By Osvaldo on Mar 17, 2025

Emperor 400

Prompt delivery and a good price.

Prompt delivery and a good price.


Rated 5 out of 5 stars
By Ronald on May 5, 2025

Shipping time

Works as advertised

Works as advertised


Rated 5 out of 5 stars
By Albert on Dec 17, 2024

Quality

On time delivery and great price!!!

On time delivery and great price!!!