It is a chore that you would not do daily, frequently, or even occasionally. It is one that you would probably do once in a blue moon if you are to bring some poetry into the task of draining your in-ground swimming pool. In-ground pools could retain the water in it for years and the same water could be controlled studiously by adding the right chemicals to keep it clear, clean, healthy and safe for everyone using it.
When the inevitable happens
But there is always the inevitable and when that happens you would see the blue moon on the horizon as it would necessitate a draining of your in-ground pool. The time would be when there are repairs to be executed to your swimming pool which cannot be carried out with water in it. The other pertinent issue would be when no proper response is forthcoming to the addition of chemicals in the water to keep it clean, healthy and safe for pool users.
After a few years depending on how you have progressed with the adding of the various chemicals there would be a slack in the water reacting positively to the addition of chemicals like chlorine and others. Even though reluctantly it would be time for you to drain the water and replenish your swimming pool with fresh water and start all over again. Though you would need to do so it would be prudent to consider all inherent factors before you would go ahead with this very meticulous task.
The issue with Total Dissolved Solids
When the Total Dissolved Solids (TDS) rises to uncontrollable limits the water would not react positively to the addition of chemicals to keep the pool water safe and healthy. The issue of TDS would also cause stains on the swimming pool walls and that would not be a good sign for the longevity of your pool as it could cause other uncontrollable issues. Hence it would be time to drain your in-ground pool and fill it up with fresh water. Though it may sound easy there are some very important criteria which you would have to adhere to before you could do that.
For one there are restrictions in siphoning water into the main sewage drains. Swimming pool water contains chemicals and draining it into public drains could put you in trouble with the laws prevailing in your area. It would be prudent to check what the options are and find the right one before you get into the wrong books of the local authorities.
Damage due to reduction in weight
Another important factor closer to your interest would be when you drain off all the water in the swimming pool, which would naturally lessen the weight of the pool structure. If the soil under the swimming pool is soft with the loss of weight of water your in-ground swimming pool could lift up a few inches and if it does in totality you may not have a problem but if one half comes up with the other part remaining it would take just common sense to know what would happen, The floor of your swimming pool could crack and that would be a bigger drain on your wallet.
To avoid such a calamity it would be advisable to drain the water in your swimming pool gradually and stop when it is half empty and then fill it up and then add the necessary chemicals and then test the TDS. If it is still high especially after a few days you could start draining the water back again till it is half empty and start all over again. Though this might not be the most appropriate exercise it could help you to prevent a gigantic disaster form occurring. If your swimming pool floor cracks up even a little it could spell disaster and could cost you much more to repair and bring back to usage again.
Draining your in-ground pool may look a simple exercise but it has many aspects that you need to look at before you would embark on the task. To be doubly sure and to avoid any untoward happenings it would be prudent to call a professional and dole out a few dollars and let them do it. They would study your pool and would take the responsibility for any damages occurring if you negotiate with them terms favorable to you. They do this often but for you it would be once in a blue moon.