Boyu · Internal
SP-C / SP-B Internal Filter
- Flow
- 300–1,400 L/h
Quarantine, hospital or grow-out tanks, and simple community tanks that need an easy internal filter.
4 models
Juwel · Internal
Juwel Bioflow
The large internal box filter built into Juwel aquariums, also sold on its own. Water runs down through stacked sponges and media baskets, with space for a Juwel heater inside the housing and an Eccoflow pump on top. There are no hoses, so nothing can leak outside the tank.
Updated
600–1,000 L/h3 models
Will it suit my tank?
litres
Best for
Juwel owners replacing or upgrading a filter, or anyone happy with a big internal box in exchange for no hoses.
Worth knowing
It takes up a noticeable slice of the back corner and needs a tank at least 42.5 cm (M) or 60 cm (L, XL) tall.
What stands out
- Three sizes: M (3.5 L media), L (8 L), XL (11 L)
- 600 or 1,000 L/h Eccoflow pump using 7 to 8 W
- Room for a Juwel AquaHeat heater inside the filter
- Five media stages supplied: poly pad, carbon, Nitrax, coarse and fine sponges
Models and specs
| Model | Flow | Tank size | Power | Media volume | Dimensions (L × W × H) | Minimum tank height | Pump |
|---|---|---|---|---|---|---|---|
| M2073582 | 600 L/h | up to 300 L | 7 W | 3.5 L | 15.5 × 10.2 × 41.7 cm | 42.5 cm | Eccoflow 600 |
| L2073584 | 1,000 L/h | up to 400 L | 8 W | 8 L | 20 × 13.2 × 53.2 cm | 60 cm | Eccoflow 1000 |
| XL2073586 | 1,000 L/h | up to 500 L | 8 W | 11 L | 22.5 × 15.5 × 53.2 cm | 60 cm | Eccoflow 1000 |
- Brand
- Juwel
- Pump
- Juwel Eccoflow (included)
- Heater
- Takes a Juwel heater (sold separately)
- Cable length
- 2.38 m
Figures from Charterhouse Aquatics's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all filters
Dophin · Internal
950F Series Internal Filter
- Flow
- 470–1,550 L/h
- Tank size
- up to 300 L
A larger tank that needs strong extra circulation plus some mechanical filtration.
4 models
Dophin · Internal
F Series Internal Filter
- Flow
- 360–800 L/h
- Tank size
- up to 160 L
A mid-sized tank where you want an internal filter that tucks into a back corner.
3 models
Dophin · Internal
FB Internal Filter
- Flow
- 300–760 L/h
- Tank size
- up to 140 L
A basic community or planted tank where a simple sponge internal filter is enough.
4 models
Frequently asked questions
Quick answers about the Juwel Bioflow, drawn from its specs.
What size tank is the Juwel Bioflow good for?
Using the 5 to 12 times turnover rule for planted tanks: M (600 L/h, suits roughly 50–120 L); L (1,000 L/h, suits roughly 83–200 L); XL (1,000 L/h, suits roughly 83–200 L). The maker rates the range for tanks up to 500 L. Real flow with media and hoses is lower than the rated figure, so pick the bigger model if you are between sizes.
Who is the Juwel Bioflow best for?
Juwel owners replacing or upgrading a filter, or anyone happy with a big internal box in exchange for no hoses.
Is there anything to watch out for with the Juwel Bioflow?
It takes up a noticeable slice of the back corner and needs a tank at least 42.5 cm (M) or 60 cm (L, XL) tall.
What are the alternatives to the Juwel Bioflow?
Other filters worth comparing: Boyu SP-C / SP-B Internal Filter, Dophin 950F Series Internal Filter, Dophin F Series Internal Filter. Add any of them to the compare table to see the specs side by side.