Keeping you hot tub clean is one of the most important things you need to learn about. Assuming that you have a hot tub that has water on it all time and is holding around a hundred degrees, there are some things you need to know on how you can maintain the cleanliness of your hot tub. Hot and wet environments are breeding grounds for bacteria. So it's much better if you have the right knowledge to clean it.
Since it takes time to drain and refill a hot tub after every use, or even every week and it will wear down your heating unit, not to mention your water bill will increase like skyrocket. That's why they make chemicals, the same for pools, to keep you hot tubs clean and healthy. These chemical levels will need to be tested often to maintain efficiency. The better care of your hot tub you take, the longer it will last.
If your hot tub spa filter is dirty it can reduce the water flow and overall performance. Filters are expensive and you do not need to replace the filter every time
Generally you should drain and clean inside part of your hot tub every three months. Do not clean the interior acrylic with a corrosive cleaning product. Mild bathroom cleaner that doesn't contain excess soap will suffice. Use a sponge to wipe inside and out and be sure to rinse it thoroughly.
You should try not to use anything too soapy because when you try to fill it up again it could just turn into a giant bubble bath and could end up damaging to the interior works. Check hot tub stores for safe interior cleaners to use.
Upon refilling, you will need to add and test the chemical levels. There are three known sanitizers used currently such as Chlorine, Bromine and ozone. Bromine is less corrosive to the skin while Chlorine has less strong of a smell. Ozone is a piece of equipment inside the motor compartment. Ozone oxidizes the water but doesn't provide complete cleansing so a mild form of Bromine should be used as well.
Weekly you should test the pH level, or the level of acidity. It should be between 7.2 and 7.8. Also you need to measure "Total Alkalinity"; this should be 80-120 PPM. This measures the waters ability to withstand change in the pH level. If it's low, you can increase it by adding sodium bicarbonate (baking soda).
Always add small amounts of chemicals at a time, it's always easier to add a little more than to try and take out too much that was added. When using test strips make sure you're not using the surface water, go at least 6-12 inches below the water surface by using a test tube or glass. Try not to touch the water in the test tube or it will corrupt your water sample.
You should "shock" (oxidize) your water regularly especially after water contamination. By shocking the water it breaks down organic contaminants and other things that bacteria can feed on. To do this, you can either use chlorine or a non chlorine method. Non chorine shock is done with mono per sulfate or MPS for short. Its oxygen based and has very little odor.
If it's fresh water, you should use chlorine shock, it will leave a residual that is a necessity for a good clean spa. Be sure to follow the directions of the shocking treatment of the product that you buy. Make sure that you and your family will avoid using the hot tub spa for 2 hours every time you finish cleaning your hot tub spa.