No more brown deposits by silicates Silicates are found in tap water or are released from the substrate. Silicates can promote the growth of diatoms. These can form unsightly brown deposits on plants and substrate. Bio-Exit Silicate neutralizes silicates quickly and efficiently. Bio-Exit Silicate is available in various packaging quantities: 250 ml - 500 ml - 1000 ml. Neutralizes silicate cause of brown deposits (diatoms) Dosage Dosage 10 ml per 20 liters on day 1 and on day 3. No water change for 7 days after the first dose.