🔍 Key Concepts

• 33 CFR Subchapter O definitions section for Marine Sanitation Devices (MSDs) • Differences between Type I, Type II, and Type III MSD performance standards • Specific numeric limits for fecal coliform bacteria and suspended solids / visible solids

💭 Think About

• Compare which answer choices give a performance standard (measurable output limits) versus a design/intent description • Ask yourself: Does Type I focus on no discharge at all, or on how clean the treated discharge must be? • Look closely at the exact numbers for fecal coliform and whether the rule mentions suspended solids or visible floating solids for Type I

✅ Before You Answer

• Verify in 33 CFR Subchapter O the precise numeric limit for fecal coliform in a Type I MSD (is it 200 or 1,000 per 100 mL?) • Check whether Type I references suspended solids (mg/L) or simply no visible floating solids • Confirm which description (performance numbers vs. prevention of discharge) actually matches Type III, so you don’t confuse it with Type I