HTH

HTH makes pool chemicals. Not kitchen cabinets, not travel insurance, not Danish furniture — despite what some confused web results suggest. They make three core products that matter: shock treatments, chlorine tablets, and sanitizing granules. All designed for pool and spa water treatment.

The brand trades on chemistry that works. Their 1-inch chlorine tablets pack 90% available chlorine. Their shock granules deliver 54% available chlorine with 56.44% calcium hypochlorite. Numbers that mean something to contractors who need predictable results.

The Products That Matter

HTH Super Shock Granules come in 1-pound bags, sold as a 6-pack. The fast-dissolving Cal-Hypo formula restores crystal clarity in 24 hours. That’s not marketing fluff — it’s calcium hypochlorite doing what it does. No cyanuric acid means no over-stabilization. Montana’s short pool season doesn’t need stabilizer buildup.

HTH Super Shock Specifications	Value
Active Ingredient	Calcium Hypochlorite (56.44%)
Available Chlorine	54%
pH Level (1% solution)	10 - 11.5
EPA Registration	1258-1250
Package Size	6 x 1 lb bags

Their 5-pound bucket of 1-inch chlorine tablets uses trichlor chemistry — approximately 90% available chlorine in slow-dissolving form. UV stabilized with cyanuric acid, these tablets last up to one week. Compatible with salt-water systems, vinyl-lined pools, and automatic feeders. The tablets that pool contractors actually stock.

The 5-pound chlorine granules serve double duty — daily chlorination and weekly shocking in one product. Calcium hypochlorite based, no added cyanuric acid. Prevents chlorine lock by not adding CYA to the water. Smart chemistry for pools that see real use.

Why These Formulations Work

Montana’s high-altitude UV hammers pool chlorine. HTH’s UV-stabilized tablet formula includes cyanuric acid protection — necessary when summer sun sits at 7,000+ feet elevation. But here’s the catch: too much stabilizer locks up your chlorine. That’s why their granular products skip the CYA entirely. You add stabilizer when you need it, not with every dose.

The shock treatment’s 4-in-1 formula kills bacteria, prevents algae, reduces chlorine odor, and restores water clarity. Safe for all pool surfaces including vinyl and fiberglass. No special handling for different pool types — one product, consistent results.

Cold water dissolves chemicals slowly. HTH’s fast-dissolving granular formulas compensate for Montana’s cooler pool temperatures. When Memorial Day weekend means 65-degree water, you need chemistry that works without waiting.

Application timing matters — evening application optimizes chlorine retention. Less UV degradation overnight means more sanitizer working in the morning. Basic chemistry that saves money.

The differentiator isn’t complexity — it’s consistency. Cal-hypo delivers visible results within 24 hours. Trichlor tablets maintain 1-4 ppm free chlorine for up to a week. Predictable performance that pool service contractors can schedule around.

Skip HTH if you’re running a bromine system or looking for specialty algaecides. These are chlorine products, period. But for standard chlorine pool maintenance — the bulk of Montana’s residential pools — HTH delivers professional-grade chemistry without the professional-only distribution hassles.

Frequently Asked Questions

What’s the difference between HTH’s chlorine tablets and granules?

Tablets use trichlor chemistry with 90% available chlorine and built-in cyanuric acid stabilizer, dissolving slowly over a week. Granules use calcium hypochlorite with no stabilizer, dissolving quickly for immediate chlorination or shocking. Tablets maintain baseline chlorine levels. Granules fix problems fast.

Can HTH products be used in a salt-water pool?

Yes — all three products specifically list compatibility with salt-water systems. Salt generators produce chlorine, but you still need shock treatments and supplemental chlorination during heavy use periods.

Why does HTH avoid cyanuric acid in their granular products?

CYA prevents “chlorine lock” — when stabilizer levels get too high, chlorine stops working effectively. By keeping shock and granular products CYA-free, HTH lets you control stabilizer levels separately. Critical for Montana’s short pool season where over-stabilization happens fast.

How much shock is needed for a typical residential pool?

HTH packages their shock in 1-pound bags, with 6 bags per pack. Standard shock treatment runs 1 pound per 10,000-15,000 gallons, depending on bather load and water condition. The 6-pack covers multiple treatments or one heavy shock for larger pools.

Does HTH make anything besides pool chemicals?

HTH has been a pool and spa chemical brand for decades. Web confusion with Danish furniture makers and travel insurance appears to be different companies with similar names. The HTH at building supply stores makes pool chemicals exclusively.