Though the growth rate of algae slows down as water gets colder, we recommend keeping the free chlorine level between 2-4 ppm, as mentioned above. In some areas it's possible to see steady temperatures above 60 degrees in January or even February, giving algae a chance to grow. Don't risk it.
Start by pulling the cover back so that at least half of the pool is exposed. Pre-dissolve your pool shock (always follow label instructions), add it to the water, then vigorously brush the pool to agitate the water. Alternatively, you can also use a submersible pump and a length of hose to get the water moving.
Never use chlorine tablets during the winter: you'll want to opt for Assault 73 Shock or Quick Shock granular chlorine once a month (1 pound per 10,000 gallons.) After shocking, run the filter for 12 hours, then shut off.
Lower The Salt Level
Use salt test strips for an accurate reading and when the season starts cooling down, do not add anymore salt to the pool. It is better not to have a lot of salt in your pool toward the end of the season.
Chlorinated and non-chlorinated pools freeze at the same temperature. However, salt water pools will freeze at a slightly lower temperature. It should also be noted that above-ground pools will generally freeze at a higher temperature than inground pools.
There is no harm in using liquid chlorine after storing it through the winter, but it will be less effective than when initially purchased. Pool chlorine comes in different forms with differing levels of stability.
Chlorine is a common disinfectant that is widely used in swimming pools and leisure centres. Chlorine should not be stored with ammonia, acetylene, benzene, butadiene, hydrogen, any petroleum gases, sodium carbide or turpentine.
Alkalinity Adjusting Chemicals for Pool Start Up
This should be the first chemical that you add to your pool during start-up. This one can really affect the pH level of your pool. Sorting this out first prevents you from ruining your hard work on your pool's pH level by doing it afterward.
Properly stored chlorine tablets should last three to five years. The storage site should be cool, dry and well-ventilated, such as in a basement. Never leave chlorine tablets in the direct sun, even in a covered bucket, because the heat will accelerate the degrading process of the tablet and its ingredients.
Sodium Bisulfate and muriatic acid could have a 5 year shelf life, however pH decreasers are acids, and a larger shelf life concern about pH decreasers is the strength of the container. Over time, thin plastic bottles or packaging can break down from contact with acids.
Well-known member. chem geek said: As described in this post, the freezing point of full-strength Muriatic Acid (31.45% Hydrochloric Acid) is -46ºC (-50.8ºF). Half-strength Muriatic Acid (15% Hydrochloric Acid) has a freezing point of -18ºC (-0.4ºF).
The solid is calcium hypochlorite [Ca(OCl)2], available in granular form or as tablets. If cost is an issue, chlorine gas is a clear choice because calcium hypochlorite is only 65% available chlorine, sodium hypochlorite is 12.5%.
It is best practice to remove your salt cell during the colder winter months. By removing your cell, you limit the potential damage that may occur to the unit during cold or freezing temperatures. The cold water and temperatures can damage the plates and stop the salt cell from functioning as intended.
Algaecide is the best way to prevent algae from growing in your unused pool. Generally, the colder the winter, the longer-lasting algaecide you'll want. Some winter algaecides last up to three months. You should pour in the algaecide on the last day you use the pool for the season and let the pump run for 24 hours.
If you had your pool professionally winterized, and your pool has turned green throughout the winter, this may be a signal that it's time for a new cover. Pool covers can get less effective throughout years of sun exposure and general wear and tear.