HTH 5LB Granule Chlorine

HTH’s calcium hypochlorite granules deliver measurable all-in-one pool treatment with 24-hour visible results, eliminating the cyanuric acid buildup that causes chlorine lock. This 5-pound granule formula handles six key functions: sanitization, shocking, clarification, softening, stain prevention, and filter aid — consolidating what typically requires multiple products into one container.

The fast-dissolving Cal-Hypo formula works for both daily chlorination and weekly shocking, maintaining 1-4 ppm free available chlorine. With 4.5+ star ratings across major retailers, pool service contractors count on this single product to handle multiple maintenance tasks.

Cal-Hypo Performance Without CYA Buildup

The unstabilized calcium hypochlorite formula contains no added cyanuric acid. That matters. Standard stabilized granular shocks contain cyanuric acid (CYA), whereas HTH Cal-Hypo granules do not, preventing high CYA levels. Pool contractors know that CYA levels above 50 ppm start blocking chlorine’s effectiveness — what the industry calls chlorine lock.

HTH’s formula prevents ‘chlorine lock’ by not adding cyanuric acid. Montana’s short pool season means contractors can’t waste time draining pools to fix CYA problems. Every shocked pool stays responsive to chlorine adjustments throughout the season.

Unlike liquid chlorine, HTH granules often include water softeners and clarifiers, making them an ‘all-in-one’ solution. The formula clears cloudy water and provides visible results within 24 hours. Contractors appreciate telling clients they’ll see improvement by the next day — a promise this product delivers on.

All-in-One Treatment Specs

The six key functions — sanitization, shocking, water clarification, water softening, stain and scale prevention, and filter aid — reduce chemical inventory for service trucks. One product handles what typically requires separate sanitizer, shock, clarifier, and softener bottles.

Specification	Value
Weight	5 lb (2.27 kg)
Active Ingredient	Calcium Hypochlorite (Cal-Hypo)
Chlorine Type	Unstabilized (No added cyanuric acid/CYA)
Target Concentration	1-4 ppm free available chlorine

Safe for all pool types, including vinyl-lined and salt systems. That compatibility matters in Montana’s diverse pool market — from basic above-grounds to high-end saltwater systems in Whitefish.

Apply directly to the pool water or dissolve in a bucket for even distribution. Evening application is recommended to reduce chlorine degradation from sunlight. Montana’s long summer daylight hours make evening dosing particularly effective — chlorine works overnight without UV breakdown.

Professional Application Guidance

Applications include daily pool maintenance for sanitation, weekly pool shocking to oxidize contaminants, and hot tub and spa water cleaning. The granular form dissolves quickly without leaving residue on pool surfaces.

Regularly test water to maintain 1-4 ppm free available chlorine. Pool contractors managing multiple properties appreciate the consistent dosing — same product for routine maintenance and problem-solving.

Meijer mentions a 90-day return window, though warranty details vary by retailer. Customer satisfaction runs high with 4.5+ ratings on Walmart (203 reviews), Lowe’s (96 reviews), and 4.8 ratings on Ace Hardware (36 reviews) and Fred Meyer (32 reviews).

The verdict? HTH’s granule chlorine solves real problems for pool contractors. No CYA buildup means pools stay manageable all season. Six-in-one functionality reduces chemical inventory. Fast-dissolving formula works in all pool types. For Montana’s compressed pool season, that efficiency translates directly to more pools serviced per day.

Frequently Asked Questions

Q: Does HTH 5LB Granule Chlorine add cyanuric acid to my pool?

No, HTH 5LB Granule Chlorine uses unstabilized calcium hypochlorite (Cal-Hypo) with no added cyanuric acid (CYA). This prevents the chlorine lock problem that occurs when CYA levels get too high, keeping your pool responsive to chlorine adjustments all season.

Q: What makes HTH granules different from liquid chlorine?

HTH granules include water softeners and clarifiers built into the formula, making them an all-in-one solution that handles sanitization, shocking, water clarification, water softening, stain prevention, and filter aid. Liquid chlorine typically only sanitizes, requiring separate products for these other functions.

Q: How fast will HTH 5LB Granule Chlorine clear up cloudy pool water?

HTH’s fast-dissolving Cal-Hypo formula clears cloudy water and provides visible results within 24 hours. The granules dissolve quickly when applied directly to pool water or pre-dissolved in a bucket for even distribution.

Q: Can I use HTH granules in vinyl-lined pools and salt systems?

Yes, HTH 5LB Granule Chlorine is safe for all pool types, including vinyl-lined pools and salt water systems. The calcium hypochlorite formula won’t damage vinyl liners when used as directed.

Q: What’s the best time to apply HTH granules to avoid chlorine loss?

Evening application is recommended for HTH granules to reduce chlorine degradation from sunlight. Applying after sunset lets the chlorine work overnight without UV breakdown, maximizing effectiveness.

Q: What chlorine level should I maintain with HTH 5LB Granule Chlorine?

HTH recommends maintaining 1-4 ppm free available chlorine in your pool. Regular testing ensures proper sanitization levels for both daily maintenance and after weekly shock treatments.