FreshWater Chlorine Granules 2 lb | Spa Chlorine

• 1 × 2 lb container of FreshWater Concentrated Chlorinating Granules — sealed plastic container with screw cap
• Use directions, dosage chart, and safety information — printed on the label

• Fast-dissolving dichlor formula — granules fully dissolve in seconds, no waiting, no clumping
• pH-neutral chlorine — won't drive pH or alkalinity out of range with every dose
• Dual-purpose use — primary sanitizer for chlorine programs, or shock/oxidizer for salt, mineral, and ozone programs
• Right-sized 2 lb container — appropriate quantity for new users, smaller spas, or occasional shock dosing on non-chlorine programs
• Universal sanitizer system compatibility — works as primary or secondary sanitizer with FreshWater Salt, ACE, Ag+, ozone, and direct chlorine programs
• Designed for spa volumes and temperatures — formulated for the small, hot, heavily-used environment of a residential spa, not for outdoor pools
• Granular form for precise dosing — measurable in teaspoons or ounces, no guesswork
• Genuine Watkins Wellness — formulated by the same engineering team that builds Hot Spring and Caldera spas
• EPA-registered sanitizer — meets federal requirements for residential pool and spa use

Sodium dichlor is a fast-dissolving form of chlorine. When the granules contact spa water, they release hypochlorous acid — the active chemical form of chlorine that actually does the work of sanitizing.

Hypochlorous acid does two jobs at once in spa water:

• Sanitization — destroying bacteria, viruses, and pathogens by attacking their cell membranes
• Oxidation — breaking down organic load: body oils, sweat, sunscreen, lotion, hair products

Both jobs need doing in a spa. Sanitization keeps the water safe to soak in; oxidation keeps it clear and odor-free. Once chlorine has done its work, it either evaporates as harmless chloride or binds with the organic contamination it just destroyed (creating chloramines, which is the chlorine smell most owners associate with chlorine spas).

This is why owners use this product in two distinct modes:

• Routine sanitization — small, frequent doses to maintain a 2–3 ppm free chlorine residual at all times
• Shock (superchlorination) — larger periodic doses to oxidize accumulated organic load and break down chloramines

The 2 lb container handles either use case at lower volume — making it the right size if you're not running a chlorine program full-time, or if your spa sees only periodic use.

Pro Tip: Counterintuitively, "chlorine smell" usually means you have too little active chlorine, not too much. The smell is chloramines — used-up chlorine bound to organic contamination. A shock dose oxidizes the chloramines away and restores fresh active chlorine. Reducing chlorine in response to the smell makes the problem worse.

Initial Setup (Fresh Fill)

1. Clean spa surfaces and back-flush the filter before refilling.
2. Fill the spa with fresh water and bring to operating temperature.
3. Balance the water — adjust alkalinity (80–120 ppm), then pH (7.2–7.8), then calcium hardness as appropriate for your sanitizer program.
4. Add 1/2 oz of chlorinating granules per 500 gallons of spa water as the starting dose.
5. Wait 5 minutes, then check the chlorine residual with FreshWater 5-Way Test Strips.
6. The residual should read 2–3 ppm. If it doesn't, add small additional doses until it does.
7. If chlorine exceeds 5 ppm, do NOT enter the spa. Wait for residual to drop into the 2–3 ppm range before reuse.

Routine Sanitization

• Test water with FreshWater 5-Way Test Strips weekly at minimum, or before each use
• Add chlorinating granules as needed to maintain 2–3 ppm free chlorine residual
• Typical maintenance dose is a teaspoon to a tablespoon per use, depending on spa size and bather load
• Heavy bather load increases demand — body oils and lotions consume chlorine faster, so dose more frequently after heavy use
• Add to circulating water with the spa pump running and the cover open
• Wait 5–15 minutes after dosing before retesting

Superchlorination (Shock Treatment)

For non-chlorine program owners using this product for shock, or chlorine-program owners doing periodic deep oxidation:

• Frequency: Every 1–2 weeks under normal use; nightly for heavy bather load; weekly for moderate use
• Dose: 1 oz per 500 gallons (a typical shock dose — about double the routine sanitization amount)
• Procedure: Add to circulating water with cover open. Run circulation for 15 minutes minimum.
• Wait time: Do not enter the spa until free chlorine drops below 5 ppm — typically 15–30 minutes for a standard shock dose
• Resume normal program once chlorine residual returns to 2–3 ppm

Storage and Safety

• Keep the container tightly closed between uses
• Store in a cool, dry, well-ventilated location away from direct sunlight
• Store separately from other chemicals — never store chlorine with acids, bromine, biguanide, or other oxidizers
• Keep away from children, pets, and combustibles
• Use a clean, dry scoop for measuring — never use the scoop for other products
• Wear eye protection when dosing; chlorine dust is mildly irritating to eyes and respiratory passages
• Never combine chemicals outside the spa water — always add each product separately to the full spa
• Indefinite shelf life when sealed — dichlor doesn't degrade chemically if kept dry

Pro Tip: A 2 lb container handles approximately 32 routine dosings at the standard 1/2 oz per 500 gallons rate — roughly three to four months of daily sanitization for a typical chlorine-program spa, or considerably longer if used only for periodic shock on a salt or Ag+ program. Track your use rate over the first few weeks to decide if the 3.5 lb size is the better fit on your next order.

• Brand: FreshWater® (Watkins Wellness)
• Manufacturer Part Number / SKU: 80021
• Net Weight: 2 lb
• Form: Granular
• Active Ingredient: Sodium dichloro-s-triazinetrione (sodium dichlor)
• Available Chlorine: Approximately 56% by weight
• pH Impact: Essentially neutral; does not significantly raise or lower pH at recommended doses
• Target Free Chlorine Residual: 2–3 ppm
• Routine Dose: 1/2 oz per 500 gallons (approximately a tablespoon)
• Shock Dose: 1 oz per 500 gallons
• Approximate Routine Dosings per Container: ~32 doses at the standard rate (3–4 months daily use, or longer for periodic shock-only use)
• EPA Registration: Yes — registered residential pool and spa sanitizer
• Sanitizer Compatibility: Compatible with chlorine programs, FreshWater Salt, ACE, Ag+, ozone, and MPS-based programs
• NOT Compatible With: Bromine, biguanide (Soft Soak / Baqua Spa)
• Spa Compatibility: All residential hot tubs, spas, swim spas, and cold plunge tubs running chlorine-based water care
• Sibling SKU: 3.5 lb container available — better per-pound value for full-time chlorine programs
• Shelf Life Sealed: Indefinite when stored dry and sealed
• Hazmat Classification: ⚠️ HAZMAT — DOT-classified hazardous material due to oxidizer status. Cannot be returned by mail under federal regulations. In-store returns at any LTI showroom are accepted.
• Country of Origin: Manufactured for Watkins Wellness, USA

Sanitizer Systems

• Direct chlorine programs — primary sanitizer; dose to maintain 2–3 ppm free chlorine residual
• FreshWater® Salt System — used for periodic shock and occasional boost dosing
• Hot Spring® ACE® Salt Water System — same role as FreshWater Salt
• FreshWater® Ag+ Silver Ion programs — provides the oxidation chlorine that silver ions cannot
• Ozone systems — provides residual sanitizer; ozone alone leaves no residual in water
• MPS-based programs — dichlor handles periodic full shock; MPS handles regular oxidation
• Cold plunge tubs using chlorine — proper sanitizer for chlorine-based cold plunge water care

Spa Brands

• All residential hot tubs and spas running a chlorine-based or chlorine-supplemented program — Hot Spring, Caldera, Freeflow, Sundance, Bullfrog, Jacuzzi, Marquis, Master Spas, Cal Spas, and every other major brand
• Smaller spas and plunge pools — the 2 lb size is well-matched to lower water volumes
• Inflatable and portable spas — Intex, MSpa, Coleman, and similar (test before each use; smaller volumes shift balance quickly)
• Cold plunge tubs running chlorine programs

NOT Compatible With

• Bromine systems — never mix chlorine and bromine; use FreshWater bromine products instead for brominated spas
• Biguanide systems (Soft Soak / Baqua Spa) — chlorine destroys biguanide; switching from biguanide to chlorine requires a full drain-and-refill
• Outdoor pool sanitation — dichlor is concentrated for spa volumes; pool sanitation is more economically handled with cal-hypo or trichlor

2 lb vs. 3.5 lb — Which to Choose

• Choose the 2 lb (this product) if: you're new to chlorine programs, run a non-chlorine program with periodic shock use, own a smaller spa or plunge pool, or use your spa only seasonally
• Choose the 3.5 lb container if: you run a chlorine program full-time on a typical-sized spa, want the better per-pound value, or simply prefer to buy in larger quantities

Works Alongside

• FreshWater 5-Way Test Strips — essential paired diagnostic; check chlorine residual before and after each dose
• FreshWater pH/Alkalinity Up & Down — keeps water balanced so chlorine works at peak efficiency
• FreshWater Ag+ Silver Ion Sanitizer — pairs to reduce overall chlorine demand
• FreshWater MPS Test Strips — for programs using non-chlorine shock alongside
• FreshWater Stain & Scale Defense — protects metal spa components from chlorinated water over time

Pro Tip: NEVER mix chlorine with other sanitizer chemicals (especially bromine, trichlor, or biguanide) outside the spa water. Direct combination of concentrated oxidizers can react violently — including fire risk in extreme cases. Always add each chemical separately to a full spa with circulation running.