HTH 1" Chlorine Tablets (5 LB): Precision Chemical Control for Smaller Pool Systems

HTH’s 1-inch chlorine tablets deliver approximately 90% available chlorine through trichloro-s-triazinetrione (trichlor), giving pool service contractors precise dosing control for smaller water volumes. These slow-dissolving tablets last up to 1 week per tablet, with a standard dosage of 4 tablets per 10,000 gallons — ideal for hot tubs, above-ground pools, and smaller commercial installations where 3-inch tablets would over-chlorinate.

The UV stabilized formula with Cyanuric Acid matters in Montana’s high-altitude environment where intense sun exposure burns off unprotected chlorine quickly. With an average rating of 4.75 stars across 1,790 reviews, contractors appreciate the consistent performance, though tablets can be brittle and arrive broken or as dust — a packaging issue worth monitoring on delivery.

Technical Specifications and Compatibility

Specification	Value
Active Ingredient	Trichloro-s-triazinetrione (Trichlor)
Available Chlorine	Approximately 90%
Tablet Size	1 inch diameter
Package Weight	5 lbs
Dissolution Rate	Lasts up to 1 week
Model Numbers	42031, 42047

The tablets work across all pool types: vinyl-lined pools, above-ground and pop-up pools, in-ground pools, fiberglass and concrete surfaces, salt-water systems, spas and hot tubs. This universal compatibility eliminates guesswork for contractors servicing mixed pool routes. Placement options include floating dispensers, automatic feeders, or skimmer baskets, though tablets must NOT be added directly to pool water to avoid bleaching pool surfaces.

Application and Installation Requirements

Professional installation starts with water balance. Test and balance pool water pH between 7.2-7.8 before adding tablets. General dosage runs 4 tablets per 10,000 gallons every other day, or 14 tablets per week for continuous coverage, maintaining 1-4 ppm chlorine residual. Sanitize after sunset for maximum efficiency — smart practice given Montana’s intense daytime UV that degrades chlorine effectiveness.

Compared to granular chlorine, tablets provide a slow, steady release over a week compared to the immediate spike and dissipation of granular shock. This steady-state chlorination reduces labor for service routes and prevents the chlorine roller coaster that damages equipment and irritates swimmers.

Montana-Specific Considerations

The built-in UV stabilization with Cyanuric Acid addresses Montana’s high-altitude sun exposure directly. At elevations common across Western Building Center’s service area, UV radiation intensifies significantly. Unstabilized chlorine burns off rapidly, requiring constant re-dosing and driving up chemical costs.

For Montana’s prevalent hot tub market — from private residences to lodge installations — the 1-inch format prevents over-chlorination issues common with 3-inch tablets. Dissolve rate can vary based on water flow, so contractors need to monitor and adjust floater settings based on circulation patterns unique to each installation.

The 5 lb resealable pail protects tablets from Montana’s humidity swings. Store these indoors during winter — freeze-thaw cycles turn tablets to powder faster than anything else.

Frequently Asked Questions

Q: Can these tablets be used in salt-water pools?

Yes, HTH 1-inch tablets are compatible with salt-water systems. The trichlor formulation won’t interfere with salt cell operation, though you’ll use less product since the salt system generates baseline chlorine.

Q: What’s the actual dosage for hot tubs versus pools?

Standard pool dosage is 4 tablets per 10,000 gallons every other day. For hot tubs, start with 1 tablet per 500 gallons and adjust based on bather load and test results.

Q: How do these compare to 3-inch tablets for smaller pools?

1-inch tablets are recommended for smaller or above-ground pools and spas where 3-inch tablets might over-chlorinate or not fit in dispensers. The smaller size gives finer dosage control.

Q: What causes the tablets to arrive as powder?

Tablets can be brittle and arrive broken or as dust according to user reviews. This typically results from rough shipping handling. Check shipments on arrival and contact the supplier if excessive breakage occurs.

Q: Do these tablets contain stabilizer?

Yes, the tablets are UV stabilized with Cyanuric Acid, which protects chlorine from sun degradation but can build up over time. Monitor cyanuric acid levels and dilute if they exceed 100 ppm.