Neptune DOS QD Dosing and Fluid Metering SystemNeptune DOS QD Additives Additives dosing for consistent water chemistry, like alkalinity and calcium, are crucial for maintaining live coral. The DS QD is designed to deliver additives slowly and uniformly, throughout the day to better maintain stability. When paired with a Trident or Trident NP the DOS QD can perform Trident Controlled Dosing, so as water chemistry changes so does the DQDs Neptune DOS QD Water Changes The DS QD offers a variable