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Baking soda dosage formula Based on empirical data, it takes about 1.5 pounds (about 680 grams) of baking soda to increase the alkalinity by 10 ppm for every 10,000 gallons of water. A 500-gallon outdoor whirlpool hot tub requires 170 grams of baking soda.

The number of people that an outdoor spa hot tub can accommodate depends on its size, design and function. Small bathtubs are suitable for 1 to 2 people, medium bathtubs can accommodate 3 to 4 people, large bathtubs are suitable for 5 to 6 people, and extra-large bathtubs can even accommodate 7 people or more.

Calcium oxide cleaner is a professional scale cleaner commonly used in outdoor whirlpool hot tubs and swimming pools. It is suitable for removing mineral accumulation in water, including scale and rust. This type of cleaner usually dissolves in the bathtub water and helps remove scale and rust through chemical reactions.

Turbid water is one of the most common water quality issues in whirlpool spa hot tubs. Typically, clear, transparent water is a sign of healthy water quality, while turbid water indicates that there is something wrong that needs to be addressed immediately. There are many reasons for turbid water, and here are some of the main reasons and their solutions.

According to conventional calculations, 1 gallon of water weighs approximately 8.34 pounds (about 3.78 kilograms). Therefore, we can easily calculate the total weight of 300 gallons of water: 300 gallons × 8.34 pounds/gallon = 2,502 pounds. This means that 300 gallons of water weigh approximately 2,502 pounds, or about 1,135 kilograms.

The roller bearing of the outdoor whirlpool hot tub is responsible for supporting the rotating parts. If the bearing fails, it will cause abnormal friction noise, especially when the water flows through the nozzle and massage system.

Bacteria are one of the most common health risks in spa bathtubs, especially in the environment of outdoor whirlpool hot tubs, because its humid and hot characteristics provide ideal conditions for the growth of bacteria. One of the most common bacteria is Pseudomonas aeruginosa, which is particularly active in hot tub water.

If the outdoor whirlpool hot tub water temperature is high and the air temperature is also high, the chlorine may evaporate in just a few hours to a day. For example, over the course of a day's use, the water surface exposed to the air will accelerate the evaporation of chlorine, especially if the hot tub is not covered after use.

Hydrogen peroxide is available in a variety of concentrations, and the concentration commonly used in outdoor spa hot tubs is 35% food grade. This concentration can effectively kill bacteria without causing excessive irritation to the human body and the outdoor spa hot tub.

Generally, the standard size of a double outdoor garden hot tub is roughly between 1.5 meters and 2 meters, the width is about 1.2 meters to 1.5 meters, and the depth is usually between 60 and 90 centimeters.

The total current demand of the outdoor spa hot tub can be estimated as the sum of the current of the heater, water pump and other electrical equipment. Assuming the heater is 4,000W, the water pump is 2,000W, and the other equipment is 500W, the current demand is: Itotal​=18.18+9.09+2.27≈29.54 amps (A)

The freezing point of water is 32°F (0°C). When the outside temperature is lower than this point, the water will gradually freeze. In the use of an outdoor spa hot tub, if the water stays in the pipe without sufficient flow or heating, the water in the spa hot tub pipe will begin to freeze when the temperature drops below 32°F.