You are talking about scale
After using solar energy for a long time, it is easy to produce scale. This is due to the high content of calcium and magnesium ions in tap water.
An effective way to solve it The key is not to eliminate it, but to stop producing it , that is, softening tap water before it enters the solar system, which essentially solves the scale problem.
There are many ways to soften it. I have used a pre-filter with a filter element on it before. It's inexpensive and easy to use. If you want to buy one, just search online.
Home solar water contains a high alkali content. Will there be a lot of alkalis attached to the solar water heater barrel? How to remove alkali from solar water heater?
How to clean the scale inside the solar water heater:
Hold a vacuum tube with both mains and rotate it back and forth to loosen it from the water tank sealing ring, then push it into the water tank for a while. When the bottom can be separated from the base, remove the vacuum tube, pour out the water, then add clean water, rinse it and pour it out, repeat this several times. , rinse it thoroughly before disassembling and cleaning it. First, after cleaning everything, add water to the water tank, rinse the scale and debris in the water tank, and then install the vacuum tubes one by one. Before safety, carefully check whether the. The sealing ring at the water tank installation hole is intact. In case of damage or aging, the sealing ring must be replaced with a new one. The scale in the vacuum tube floats in the water and will not stick to the inner wall of the water tank like the scale in the thermos bottle, so it is relativelyt simple to clean, but you should be careful when disassembling and not doing it. use too much force to avoid damaging the vacuum tube.
It's not that there is much alkali in solar energy, but the pH value of water changes during the heating process of solar energy and becomes alkaline . The white solids you see are calcium carbonate and magnesium carbonate. that is, generally speaking about scale, if you want to avoid scale, you have to soften the water that goes into the solar. To remove the original scale, dilute it with a special scale remover and add it for 30 minutes before draining. It's best to use it on a sunny day, as the higher temperature will make it easier to remove.