The SUNSUN YWY 800 external aquarium filter is a reliable and effective solution for maintaining crystal clear and biologically stable water in freshwater and lighter saltwater aquariums up to 220 liters.
If you are looking for an external aquarium filter that combines powerful mechanical and biological filtration with UV sterilization, the YWY 800 model is an excellent choice for beginner and intermediate aquarists.
What is the SUNSUN YWY 800 external filter?
The SUNSUN YWY 800 external filter is a closed filtration system that is placed outside the aquarium. The water passes through several layers of filter media that provide:
- Mechanical filtration (removal of solid particles)
- Biological filtration (degradation of ammonia and nitrites)
- UV sterilization (control of green water and pathogens)
This makes it extremely suitable for:
- Discus
- Cichlids
- General freshwater aquariums
- Aquaria with a higher organic load
Who is this external filter suitable for?
✔ For beginner aquarists who want a stable and easy maintenance
✔ For intermediate aquarists with more densely populated aquariums
✔ For aquariums with green water problems
✔ For systems where a lower organic load is targeted
Advantages of the SUNSUN YWY 800 external filter
The built-in 9W UV sterilizer effectively eliminates:
- green algae (water bloom)
- floating microorganisms
- some of the harmful pathogens
- Stable biological filtration
The large internal volume allows the use of various filter media:
- ceramic rings
- bioballs
- sponges
- activated carbon
For maximum efficiency, we recommend the use of high-quality filter media.
The stable construction reduces vibrations and ensures quiet operation - suitable for home conditions.
- Suitable for freshwater and light saltwater aquariums
Can be used in:
- tropical freshwater aquariums
- livestock aquariums
- lighter saltwater systems
How does a UV sterilizer improve water quality?
The 9W UV lamp provides:
- Destroys unicellular algae
- Reduces bacterial load
- Improves water clarity
- Reduces the risk of disease
This makes the SUNSUN YWY 800 external filter particularly useful in aquariums with sensitive fish such as discus. If you keep sensitive species, also see our water conditioners.
How to use the SUNSUN YWY 800 correctly?
Step 1: Preparation
When initially starting up, it is advisable to test the parameters with water tests.
- Rinse the filter media with aquarium water.
- Arrange the media according to the filtration stages.
Step 2: Installation
- Place the filter below the aquarium level.
- Connect the inlet and outlet hoses.
- Make sure there are no air pockets.
Step 3: Start-up
- Fill the system with water.
- Plug in the power supply.
- Activate the UV sterilizer if necessary.
Why is SUNSUN YWY-800 the right choice?
| Problem | Solution |
| Green water | 9W UV Sterilizer |
| Murky water | 800 l/h mechanical filtration |
| High ammonia | Biological filtration |
| Overcrowded aquarium | High flow rate and filter volume |
Frequently Asked Questions (FAQ)
Is the SUNSUN YWY 800 suitable for discus?
Yes, the SUNSUN YWY 800 external canister filter is suitable for discus with proper maintenance.
Can it be used for a saltwater aquarium?
It is suitable for milder saltwater conditions, but not for reef systems.
How often is the UV lamp replaced?
Recommended once a year with regular use.
How often is the filter cleaned?
Every 4–6 weeks depending on the load.
Is it noisy?
No, it works relatively quietly with proper installation.
Can it work without UV?
Yes, the UV sterilizer can be turned on when needed.
-250x250.webp)
-250x250w.webp)
