Leisure Time Spa Down | pH Decreaser
Leisure Time Spa Down is a fast-dissolving granular pH decreaser formulated for spas and hot tubs. Active chemistry: 95% sodium bisulfate — a dry acid that safely lowers both pH and total alkalinity when readings drift too high. The mirror-image counterpart to Spa Up, and together the two products handle every pH correction a hot tub owner will ever need to make.
High pH is one of the most common — and most overlooked — spa water problems. When pH rises above 7.8, three things go wrong simultaneously: chlorine and bromine lose effectiveness (chlorine at pH 8.0 is less than half as active as chlorine at pH 7.4), calcium and minerals fall out of solution and form scale on heater elements and jets, and water turns cloudy or dull as suspended particles refuse to coalesce. Many owners spend weeks adding more sanitizer to fix what is actually a pH problem — and the sanitizer keeps disappearing because the underlying chemistry won't let it work.
Spa Down corrects high pH quickly and precisely. The granular dry acid dissolves in seconds with the circulation system running, and a small ¼ oz. dose per 500 gallons typically lowers pH and alkalinity in measurable, predictable steps. Used as part of a weekly balance check with a quality test strip, Spa Down is the essential second half of any spa owner's pH toolkit — and significantly safer to handle than liquid muriatic acid, which it directly replaces.
Leisure Time®
Leisure Time® Brand FAQs
Can I use Leisure Time products in any brand of hot tub?
Yes. Leisure Time spa chemicals are formulated to work safely in every major brand of residential hot tub, including Hot Spring, Caldera, Sundance, Jacuzzi, American Whirlpool, Bullfrog, and others. They're also compatible with every common spa shell material — acrylic, vinyl, fiberglass, rotomolded plastic, and stainless steel.
Will Leisure Time chemicals work with my sanitizer system?
The Leisure Time line is built for universal sanitizer compatibility. Products work with chlorine, bromine, ozone, mineral cartridge systems (silver/copper), biguanide systems (Baqua Spa, SoftSoak), and salt-generated chlorine systems like the FreshWater Salt System. Specific product labels will note any exceptions.
Can I mix Leisure Time with pool chemicals or other spa brands?
We don't recommend it. Spa chemistry is sensitive, and mixing brands can lead to unpredictable interactions — cloudiness, foam, sanitizer interference, or staining. Leisure Time products are tested as a complete system; using them together gives you the most predictable results and the simplest weekly routine.
How long do Leisure Time products last in storage?
Most Leisure Time chemicals have a shelf life of 1 to 3 years when stored properly. Keep all spa chemicals in their original containers, sealed tightly, in a cool, dry, well-ventilated area away from direct sunlight, freezing temperatures, and other chemicals. Liquid products are most sensitive to temperature; granular products are more shelf-stable but should still be kept dry.
Are Leisure Time products safe for septic systems and drainage?
Yes — when spa water is properly diluted and drained according to local regulations, Leisure Time chemicals at residual levels are safe for typical municipal drainage. For homes on septic systems, drain spa water gradually over your lawn or landscape rather than dumping it all into the septic field at once. Always check local ordinances before draining.
How often do I need to drain and refill my spa when using Leisure Time?
Industry guidance is to drain and refill every 3 to 4 months for a typical 400-gallon residential spa, regardless of which chemical brand you use. Heavy use, lots of bathers, or high-temperature soaking can shorten that interval; light use can extend it. Regular use of Leisure Time clarifiers, filter care, and stain & scale products helps maintain water quality between fills, but no chemical regimen replaces a fresh refill on schedule.
About Leisure Time®
For more than 40 years, Leisure Time® has built spa-specific water care chemistry trusted by hot tub manufacturers, dealers, and homeowners across North America. Where pool chemicals are formulated for tens of thousands of gallons of cool, lightly used water, Leisure Time® products are engineered for the opposite extreme: small water volumes, sustained high temperatures, heavy bather loads, and powerful jet circulation. That combination puts dramatically more stress on water chemistry than a swimming pool ever sees, and it's why generic pool chemicals don't perform reliably in a spa.
The Leisure Time® line covers the complete water care picture — sanitization, water balance, clarity, stain and scale prevention, filter care, and spa surface care — and every product is designed to work together as part of the Simple Spa Care Program. That means no surprise interactions, no guesswork about what's compatible with what, and a predictable weekly routine that takes minutes instead of hours. The full Leisure Time® system works with chlorine, bromine, ozone, mineral cartridge, and biguanide sanitizing programs, and is safe for every common spa shell material.
Leisure Time® is manufactured in the USA and is one of the most widely recommended spa chemical brands in the industry — used by Hot Spring, Caldera, Sundance, Jacuzzi, American Whirlpool, Bullfrog, and many other major spa manufacturers as the dealer-recommended water care solution for their tubs.
