Member's Mark Chlorinating Granules, 40 lbs

Member's Mark® Chlorinating Granules are a filler-free, completely soluble chlorinating granular formula that helps keep pool and spa water clean and fresh with a fast, measurable free chlorine boost.

Three-in-One Pool Care: Sanitizer, Algaecide, and Shock

This Step 2 treatment is a versatile option for ongoing water care and periodic treatment. It functions as a sanitizer, algaecide, and shock in one product to support clean, clear water.

• Apply directly to circulating water to raise the free available chlorine level to 5-6 ppm (mg/L).
• Works as an algaecide and shock to help address water that needs attention.
• The formula is intended to help reduce chlorine odor as part of regular pool and spa maintenance.
• Listed pH level range: 6.0 - 8.0.

Filler-Free Granules That Dissolve Completely

The filler-free formula means the product is made without added fillers that can contribute to unwanted residue. The granules dissolve completely for efficient distribution in circulating water.

• Active ingredient: sodium dichloro-s-triazinetrione dihydrate.
• Formulation type: granules (completely soluble).

Made for Pools, Spas, and Hot Tubs

Ideal for swimming pools, spas, and hot tubs, these granules offer a convenient single treatment to keep on hand for multiple backyard water features.

• 40 lb size for regular pool and spa routines.
• Shelf life: 2 years (when stored properly).

Important Safety Information

• Warning: Corrosive.
• Causes irreversible eye damage and skin burns.
• Harmful if swallowed.
• Keep out of reach of children.

Frequently Asked Questions

What is Member's Mark Chlorinating Granules used for?

It’s for pool and spa water care and is described as a 3‑in‑1 product that acts as a sanitizer, algaecide, and shock.

Can I use Member's Mark Chlorinating Granules in a swimming pool, spa, or hot tub?

It’s ideal for use in swimming pools, spas, and hot tubs, and is designed to be compatible with most pools and spas.

What is the active ingredient in Member's Mark Chlorinating Granules?

Sodium dichloro-s-triazinetrione dihydrate.

Are these chlorinating granules soluble in water?

They are completely soluble.

What free available chlorine level does direct application target?

Direct application to circulating water raises free available chlorine to 5–6 ppm (mg/L).

Is Member's Mark Chlorinating Granules filler-free?

They’re described as entirely filler-free, intended to help avoid unwanted residue.

Does it affect pH or chlorine odor?

The product description says it reduces pH levels and eliminates chlorine odor.

What safety warnings apply to this product?

Corrosive; causes irreversible eye damage and skin burns; harmful if swallowed; keep out of reach of children.

What’s the shelf life of Member's Mark Chlorinating Granules?

Shelf life is 2 years.