Granular 90 2lb Bottle
Product Overview
Pool technicians reach for Regal Granular 90 when stubborn black algae spots appear on white plaster surfaces.
Regal Granular 90 is a concentrated 99.0% Trichloro-s-triazinetrione (trichlor) formula designed for targeted algae destruction. This 2 LBS bottle provides a high-potency 90% available chlorine level, making it a proven choice for eradicating localized black algae colonies that resist standard liquid treatments. Because it is stabilized, it maintains its effectiveness even under the intense UV exposure found in hot southern climates.
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Benefits & What Makes It Different
90% Available Chlorine
With a 99.0% trichlor concentration, this product delivers a high-potency dose of chlorine directly to the source of the problem.
Spot Treatment Specialist
The granular form allows for precise application on horizontal surfaces, specifically designed to penetrate the protective layers of black algae on white plaster.
Built-in Stabilization
Contains cyanuric acid to protect the chlorine from sunlight degradation, ensuring the active ingredient stays in the water longer to finish the job.
Product Details
Trichloro-s-triazinetrione 99.0%
1 lb per 10,000 gallons for spot treatment of algae.
Compatibility
- Do not mix with other chemicals, especially Cal-Hypo or liquid chlorine.
- Wait until free chlorine levels return to 1–3 ppm before swimming.
- Only for use on white plaster or white aggregate surfaces.
When To Use This
Pro Tip
Before applying Granular 90 to black algae, use a stainless steel brush to 'crack' the waxy outer coating of the algae; this allows the 99.0% trichlor to penetrate the roots more effectively.
Common Questions & Instructions
Can I use Granular 90 on a vinyl liner pool?
No, you should not use this 2lb bottle of Regal Granular 90 on vinyl, fiberglass, or painted surfaces. Because it is a slow-dissolving trichlor product, it will sit on the bottom and likely bleach or damage the liner; it is strictly for white plaster or white aggregate pools.
How much Granular 90 should I use for black algae spots?
For spot treatment, apply approximately 1 lb of Trichloro-s-triazinetrione per 10,000 gallons directly over the affected areas. Always ensure your pH is between 7.2–7.6 and total alkalinity is 80–120 ppm before application to maximize the chemical's effectiveness.
Does this product affect my pool's stabilizer levels?
Yes, since this is a trichlor-based product, it will incrementally increase your cyanuric acid (CYA) levels. We recommend maintaining a CYA range of 30–50 ppm; if your levels exceed this, the chlorine becomes less effective at killing bacteria and algae.
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.
