In most cases, your pool can even handle rain from most tropical depressions and hurricanes. If your pool is completely full after a storm or heavy rainfall, you don't need to take drastic steps such as emptying your pool. If you do, the hydrostatic pressure can cause your pool to come out of the ground.
Shocking your pool isn't necessary, although, it's not a bad idea either. If you get an extremely heavy rain fall, you could shock your pool for good measure. This will help fight off any contaminants that the rain may have brought to your pool.
The Department of Environmental Health recommends avoiding activities such as swimming, surfing, and diving for 72 hours after it rains. Research has shown that the risk of infection is the highest during and the day after rain, and declines to around normal levels after three days.
The quick answer is no. You don't need to drain your pool, as there is no risk to your pool by it being full. The only thing you lose with a pool filled to the rim is your skimmer's surface cleaning action. Overall, it still draws water and the equipment is just fine.
Your pool professional will make the call on whether a repair warrants draining the pool. Finally, most pools should be drained and refilled about once every 5-7 years, or when the total dissolved solids (TDS) reaches over 2500 ppm. When this happens, it will become difficult to balance your pool water.
The best way to drain the pool is to empty it directly into the sanitary sewer line outside your home.
When preparing your pool for a storm, leave it uncovered. Installing any kind of cover across the pool will not do much to protect against dust and contaminants because storms often bring strong winds and heavy rain that can cause the cover to lift off your pool.
Why Your Pool Turns Green and Cloudy
This can alter your pH levels and dilute the chlorine or other sanitizers, allowing algae or other contaminants to gain a foothold. Once the algae spores have the proper conditions to grow, they multiply very quickly, which is why your clear pool can turn green overnight.
With a rain storm, any number of contaminants can be washing into your pool – acid rain, pollen, insects, tree droppings, dust, sand and even phosphates. Any one or combination of these things in rain can make your pool cloudy.
Running your pool pump during a lightning or electrical storm should be avoided as a power surge or nearby lightning strike could damage your pump. However running your pump during is beneficial. The extra filtering will help clean out the impurities rain has introduced into your pool's water.
Factor #2: Frequent Use
If you use your pool or hot tub more than once per day during swim season, you may want to increase your free chlorine testing frequency to 4 or 5 times per week. Perspiration contains bacteria that free chlorine will react with to sanitize your pool.
Even with proper and regular pool maintenance, it's often necessary to drain your pool — completely or partially — every 3-5 years. Draining your pool often isn't necessary, especially if you're following a proper and regular maintenance program.
I think the answer to your question is about 3-6 days. The problem is that the chlorine that you need to keep the bacteria in check is used up more quickly as the temperature rises, the activity increases, and as sweat and other body stuff is put into the pool.
Much of this rain water penetrates into the ground, raising the inground water table, which creates a lot of hydrostatic pressure pushing up on the pool. After the water table raises enough, the pool may float or pop up out of the ground.
The level at which pool skimmers function properly is between one third and about half way up the opening of the pool skimmer. If the water level is too high the debris floating next to the opening may pass by without being pulled into the skimmer.
What happens if your swimming pool water level is too high? If your pool level is too high, your skimmer won't work as efficiently.
The water in the pool helps hold the liner into place. If you drain your pool you can cause your vinyl pool liner to shrink and upon refilling, if the liner has lost its elasticity it can cause the liner to rip or tear. The liner can also become hard and brittle.
I would suggest 2-4 ppm minimum. If the swimming pool water is really cloudy you may need to shock or super chlorinate to “zap” or oxidize the algae starting to form in the water. Note: You will need to have your TA between 80-120 for your pH to be stabilized. Leave your equipment running.