Freshwater

Grain size 0.1–0.3 mm

Fits: Juwel Rio 350

For tanks of ≤ 120 cm

For tanks of < 250 l

Grain size 0.4–1.2 mm

Fits: Juwel Rio 290

For tanks of 45–55 cm

For tanks of > 250 l

Fits: ARKA myAQUA 190, ARKA myAQUA 380

Grain size 1.6–4 mm

Fits: Juwel Rio 240

For tanks of 60–70 cm