Critical Water Storage Tanks for ANSI/AAMI ST108

Your critical water can get worse after it’s made. 
If water sits, picks up contamination, or won’t fully drain, you can lose control fast. 

Talk to an ST108 Water Expert

ST108 storage tanks are built to keep critical water clean, drainable, and easy to disinfect. 

What is a Critical Water Storage Tank?

A critical water storage tank holds high-purity water after treatment so it’s ready when your department needs it. The goal is simple: store water without letting contamination or bacteria build up. 

How ST108 Defines and Supports Proper Storage Tank Design

ST108 Requirements for Storage Tanks

ST108 gives clear direction for tank design. When storage tanks are used, they must drain completely, remain sealed, stay filtered, and be easy to clean. Proper design helps limit contamination and supports consistent water quality.

How Our Tanks Support ST108

Our tank design minimizes bacteria growth with a cone-bottom for full drainage, internal spray-down, gasket-sealed lids, and 0.2 µm vent filtration. Each feature supports clean, compliant, and reliable tank operation.

Key Features of a Compliant Tank

Our tanks use low-extractable poly materials and include high/low/full level controls, dual check valves, loop drains, sample ports, flow meters, gauges, and thermometers—everything needed for safe, compliant performance.

Where Storage Tanks Fit in the System

Storage is typically placed after purification and before distribution: Pretreatment → RO/EDI → Storage Tank → Loop → Point of Use. The tank stabilizes supply and supports ongoing control of water quality.

Our ST108 Approach

How it Works

Review Your System Layout and Water Demand

We assess how your system is built and how much water you use so the tank design supports stable flow, proper turnover, and ST108 expectations.

We guide you on the features ST108 systems need, including a drainable cone or bowl base, a 0.2 µm vent filter, and effective disinfection methods to help limit contamination.

We ensure your storage tank is sized for your flow rate, demand, and loop design, helping maintain consistent water quality throughout the system.

We help define the sampling points, monitoring frequency, and documentation needed so your tank and distribution loop stay compliant over time.

NSF Certified Chemicals

Our formulations meet NSF safety standards to protect your people and your equipment.

50+ Years of Expertise

Backed by decades of industry experience and a proven track record of results.

Regional Expertise

Serving facilities across the midwest with responsive, local water treatment support.

Optimize Your ST108 Storage Tank Setup

If you already use a critical water storage tank, we’ll review your design and identify what meets ST108 expectations—and what may be creating risk. We’ll tell you what features you actually need, what’s missing, and what to correct first to ensure your system remains clean, drainable, filtered, and fully compliant.

Our Services

Closed Loop Water Treatment

Closed loops feed your heat exchangers too. Explore our Closed Loop Water Treatment and Glycol Solutions to stop corrosion before it reaches your boiler.

Cooling Tower Solutions

Your steam system isn’t the only one that needs protection. Keep your cooling water clean and balanced with our Cooling Tower Treatment Programs.

Filtration Solutions

For maximum reliability, combine your boiler program with Filtration Solutions to remove rust and debris before they enter your feedwater system

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