Sirona® Chlorinating Granules
Product Overview
What spa technicians reach for to reliably sanitize hot tubs without clouding water or causing severe pH swings.
Formulated with 99% Sodium Dichloro-s-Triazinetrione Dihydrate, Sirona Chlorinating Granules deliver fast-dissolving sanitization tailored specifically for hot water environments. This 2 LB bottle provides targeted chlorination without leaving un-dissolved residue in spa plumbing or significantly skewing your pH 7.2–7.6 balance.
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Benefits & What Makes It Different
99% Active Sodium Dichlor
High-purity formula dissolves rapidly in hot water without leaving gritty chemical residue on spa surfaces.
Targeted Hot Tub Dosing
Precisely dosed at 0.5 oz per 500 gallons to easily maintain a clean 2 to 3 ppm free chlorine residual.
Near-Neutral pH Impact
Protects against chlorine loss while minimizing pH drift, helping keep water balanced in the 7.2–7.6 range.
Product Details
Sodium Dichloro-s-Triazinetrione Dihydrate 99%
0.5 oz per 500 gallons for routine chlorination (1 oz per 500 gallons for shock)
Compatibility
- Compatible with all acrylic, fiberglass, and vinyl hot tub and spa shell materials
- Do not mix directly with other spa chemicals or pre-dissolve in small containers of water
When To Use This
Pro Tip
Always measure using a completely clean, dry lid and broadcast over the water while jets run; in hard water areas or hot climates, maintaining free chlorine between 1–3 ppm consistently prevents scale and bio-film buildup in internal spa plumbing.
Common Questions & Instructions
How much Sirona Chlorinating Granules do I add to my spa?
For routine maintenance, add 0.5 oz per 500 gallons directly to the water with jets running to achieve 2 to 3 ppm free chlorine. For super-chlorination, dose 1 oz per 500 gallons. In hot climates, heated spa water burns through sanitizer faster, so test frequently.
Can I pre-dissolve Sirona Chlorinating Granules in a bucket before adding?
No. The 2 LB container label strictly directs you to add granules directly to the spa with the pump running. Mixing this 99% concentration dichlor with small amounts of water can cause intense chemical reactions or release hazardous gases.
Will using this chlorinating sanitizer increase cyanuric acid levels?
Yes, sodium dichlor naturally introduces cyanuric acid (stabilizer) into the water. Monitor your CYA levels to keep them in the 30–50 ppm range, and perform periodic water drain-and-refills if CYA builds up over several months of heavy use.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
