Polyaluminum Chloride (PAC) Storage — Primary Coagulant Tank Selection

Storing Polyaluminum Chloride? Start Here

If you're considering storing polyaluminum chloride (PAC), you're likely in the water treatment, industrial, or agricultural sector. PAC is a popular coagulant used to improve water clarity and quality. It's a mild-acidic liquid, typically used in municipal water treatment and various industrial processes. Understanding the right way to store it ensures safety and longevity for your tank system.

Can you store it in a poly tank?

Yes, poly tanks are suitable for storing polyaluminum chloride. Both standard polyethylene and PVC tanks can handle PAC across its commercial concentration range. For day-tank and bulk storage, polyethylene is a reliable choice.

Key Issue: Freeze Protection

One of the main concerns when storing PAC is freeze protection. PAC can freeze at temperatures as low as 15°F, which can alter its composition and effectiveness. To prevent freezing, tanks should be insulated and possibly heat-traced, especially in colder climates.

The safety that actually matters

• Ensure tanks are insulated if temperatures drop below 20°F.
• Use secondary containment to prevent spills.
• Match gaskets to the manufacturer chart for compatibility.
• Handle with care to avoid skin and eye contact.

Common questions

Is PAC hazardous to store?

While PAC is less hazardous than many chemicals, it can cause skin and eye irritation. Proper handling and storage are crucial.

Does PAC require special venting?

PAC does not off-gas significantly, so a free atmospheric breather is usually sufficient.

What happens if PAC freezes?

If PAC freezes, it may not return to its original state upon thawing, leading to reduced effectiveness and sludge buildup.