Hot Tub Cleaning: Get Perfectly Balanced Hot Tub Water Every Time
The hot tub is a unique and cherished feature of a home, a vessel of relaxation and hydrotherapy that promises to melt away the stresses of the day. It is a place of quiet solitude under the stars or a centerpiece for social gatherings with friends and family. But this luxury comes with a non-negotiable responsibility. A hot tub is not a “set it and forget it” appliance like a refrigerator or a dishwasher. It is a small, self-contained, and highly active body of water, a delicate ecosystem that requires consistent, diligent maintenance to remain a source of pleasure and not become a source of murky, unsanitary, and potentially hazardous problems. The Chemistry of Water To own a hot tub is to become a part-time water chemist. The warm, bubbling environment that is so inviting to us is also the perfect breeding ground for bacteria, algae, and other microorganisms. The key to a clean, safe, and enjoyable hot tub experience is not about performing a massive, hours-long cleaning session once a year. It is about a regular, simple, and consistent routine of testing, balancing, and sanitizing. Understanding the fundamentals of this routine is the most important aspect of hot tub ownership. The foundation of hot tub care is water chemistry, and the three most important pillars of that chemistry are alkalinity, pH, and the sanitizer level. These three elements are interconnected, and a problem with one will inevitably affect the others. The first step for any hot tub owner is to get comfortable with testing the water, which should be done at least two or three times a week, or more often with heavy use. The most common method is with test strips, which are simple, color-coded strips of paper that you dip into the water for a few seconds. The first level you should check and adjust is the total alkalinity. Alkalinity is the water’s ability to resist changes in pH. It acts as a buffer, a stabilizing force that prevents the pH level from swinging wildly. The ideal range for total alkalinity in a hot tub is typically between 80 and 120 parts per million (ppm). If your alkalinity is too low, the pH will be unstable and can drop suddenly, making the water corrosive. If it is too high, it can cause the pH to drift upward, leading to cloudy water and scale formation. You can raise the alkalinity with a product often called “Alkalinity Increaser” (sodium bicarbonate) and lower it with a pH decreaser (sodium bisulfate). Always adjust the alkalinity first, before you address the pH. Alkalinity Once your alkalinity is in the correct range, you can adjust the pH. The pH is the measure of how acidic or basic your water is, on a scale of 0 to 14. A pH of 7 is neutral. The ideal range for a hot tub is between 7.4 and 7.6. This is not an arbitrary number; it is slightly alkaline to match the natural pH of the human eye, which is why it is the most comfortable for bathers. If the pH is too low (acidic), the water can be corrosive to the hot tub’s components, like the heater and the pump seals, and it can be irritating to the skin. If the pH is too high (basic), it will cause the sanitizer to become sluggish and ineffective, lead to cloudy water, and promote the formation of scale on the shell and in the plumbing. You can raise the pH with a “pH Increaser” (sodium carbonate) and lower it with a “pH Decreaser” (sodium bisulfate). Only after both the alkalinity and pH are properly balanced can you effectively manage the sanitizer. The sanitizer is the chemical that actively kills bacteria and other harmful microorganisms in the water. The two most common types of sanitizer are chlorine and bromine. Chlorine is fast-acting and a powerful oxidizer, but it can have a stronger chemical smell and is less stable in the hot, high-pH environment of a spa. Bromine is more stable at higher temperatures and has a less noticeable odor, making it a very popular choice for hot tubs. It also has the unique ability to be reactivated by “shocking” the water. The ideal level for chlorine is between 1 and 3 ppm, and for bromine, it is between 3 and 5 ppm. You must maintain these levels at all times to ensure the water is safe for bathing. Hot Tub Filters Even with a perfectly maintained sanitizer level, the water will accumulate other unwanted waste products over time. Soaps, lotions, deodorants, and organic matter from bathers build up in the water, creating a food source for bacteria and making the water cloudy and unpleasant. To combat this, you need to “shock” your hot tub on a regular basis, typically once a week. Shocking is the practice of adding a large dose of an oxidizer to the water. This does several things: it breaks down all the organic waste, it kills any resistant bacteria, and in a bromine spa, it reactivates the used bromine ions, turning them back into effective sanitizer. Always shock the spa with the cover off and the jets running to allow it to circulate properly and to let the gasses vent. Beyond the daily and weekly chemical maintenance, the hot tub has other physical components that require regular attention. The most important of these is the filter. The filter is the kidney of your hot tub, constantly working to remove small particles, hair, and debris from the water. A dirty, clogged filter cannot do its job, which will result in cloudy water and will put a strain on your pump. The filter cartridges should be removed and rinsed with a garden hose at least once a week. The goal is to spray the debris out from between the pleats of the filter. Every few months, the filter needs a deep clean. This involves soaking it overnight in a specialized filter cleaning solution to break down
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