Biofilm is a type of bacteria that can grow in a spa, skimmer basket, or even a filter. To get rid of the biofilm for good, you will need to thoroughly clean your spa and chemically treat your filters and plumbing. See details below.
First, you are going to need to buy a product that is made specifically to kill biofilm, as this nasty bacteria is resistant to your typical cleaning solutions such as chlorine and bromine.
Once you have the treatment, you will need to wipe off all the surfaces in your spa. Doing so will lift the biofilm so that when you start the chemical treatment it can penetrate to the bottom layers of the bacteria to kill it. You will also need clean your spa cover so that you don't reinfect your spa when you are done treating it.
Lastly, you only need to follow the instructions for the water treatment that you bought so you can get rid of it for good. By removing the biofilm from your hot tub or spa, you should enjoy a longer life expectancy to the life of your spa, filters, and heater! You will also notice that it will be much easier to maintain the proper balance of chemicals in your spa.
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