What is a Salt Water Pool?
A salt water pool is a pool that is chlorinated using a special piece of equipment and ordinary salt. This works because ordinary salt is chemically made up of two elements–sodium and chlorine. The special salt cell turns the salt into hypochlorous acid, which is the same substance used in many traditional pools.
The difference between those traditional pools and a salt water pool is that in the latter, hypochlorous acid is constantly recombining with the sodium in the water and turning back into salt. Salt does not evaporate, so there is no need to add chlorine to the system on a regular basis. These systems typically do not experience chloramine buildup the same way traditional pools do, either.
Pros and Cons of Salt Water Systems
Salt water pools are typically softer-feeling on the skin and easier to maintain. However, they do have some downsides. The two major downsides are expense and corrosion.
It is definitely expensive to start up a salt water pool. Systems start at about $400 and go up to about $2,000. However, operating costs in the long run are usually low, with the exception of replacing the salt cell. It can be difficult to compare traditional pool and salt water pool costs because many people do not know what a reasonable estimate for the cost of pool chemicals is.
Corrosion is the other major downside. To avoid corrosion, we recommend that you use special equipment like hand rails and light covers that are made specifically for salt water pools. The pool plaster lifecycle for an inground pool filled with salt water versus a traditional chlorine pool is only a few months shorter, but with the proper care, easily outlasts most inground pools that may be neglected by their owners. The salt water makes no difference to a fiberglass pool.
The problem of salt water outside of the pool is actually a greater issue in many cases. Decking that is not resistant may take a beating from pool water that is splashed out or dripped from swimmers. Some types of decking are more vulnerable than others. Our team can recommend, design, and build a backyard environment that accounts for these conditions and minimizes any corrosion effects.
Are Salt Water Pools Safe?
Yes. Because the system generates chlorine that reaches the same levels as are found in a traditional pool, there is no difference in the sanitizing power. The only exception to this rule is when stabilizer levels are not kept high enough. Hypochlorous acid is not very stable and breaks down easily in the sun. Because of this, salt water pools need to maintain an adequate stabilizer level in order to keep chlorine levels stable.
Some people prefer salt water pools because they believe that the chlorination process is safer this way. It is true that salt water pools do not produce chloramines, which are common chemicals resulting from the reaction of organic material such as skin cells and oils with the chlorine in a traditional pool. They are responsible for many of the adverse effects that people usually attribute to chlorine, such as red eyes and itchy skin. There may or may not be fewer other chemicals used in the maintenance of a salt water pool.
Are Salt Water Pools More Expensive or More Difficult to Own?
Salt water pools are definitely more expensive to start. However, over time the cost may even out. The main expenses involved in starting a salt water pool include the purchase of the salt cell and pump, and the salt itself. The salt cell needs to be replaced in 3-7 years, and it can cost $300-$800. However, the life of the salt cell is dependent on how much it is used.
In general, salt water pools are easier to own and maintain. They do require the same testing as traditional pools, but the system is more self-contained. Usually, if the chlorine levels in the pool are not adequate, all that is required is to adjust the settings on the control box. Other chemicals that are used in traditional pools may also need to be used in salt water pools.
What Kind of Maintenance Does a Salt Water Pool Require?
The main maintenance tasks for salt water pool owners are testing and washing the salt cell. Water testing is still required because chlorine is only one of the parameters that needs to be controlled in order to maintain a healthy pool. If the pH or other parameter is not where it should be, the addition of certain chemicals may be necessary to balance the system.
Cleaning the salt cell is only required if scale is found on it during the regular maintenance check. These are usually done every three months. It is easy to remove the scale, either with a plastic or wooden tool or a quick rinse in dilute acid.
What Kind of Filters Do Salt Water Pools Use?
The salt cell in a saltwater pool is not responsible for the filtration. This job belongs to an ordinary pool filter which is connected to the salt generator system. Most types of pool filters can be used with saltwater systems, including sand filters, cartridge filters and diatomaceous earth filters. Each has advantages and disadvantages. One important thing to remember is that the filter will need to run a lot because the pool is only generating chlorine when the filter is on.
How Do You Winterize a Salt Water Pool?
Saltwater pools have a few unique issues when it comes to winterizing. One of them is that the sensors on the salt system can become inaccurate when the water gets too cold. Besides possibly giving faulty readings about salinity, the other issue is that most systems are calibrated to shut down at around 50-59 degrees F when the system gets too inaccurate.
This means that pools that will be used during the winter but not kept to a consistently higher temperature than 50 degrees will need a different source of chlorination. For most people, this isn’t a problem because either the pool is not in use or the water temperature is being maintained at a higher level than this.
In terms of winterizing a saltwater pool that will not be in use, it is relatively similar to winterizing any swimming pool. The water should be carefully balanced and the filter and salt system disconnected, drained, and stored for the winter. Sometimes part of the salt system can remain in place while other components are removed.
If you have any questions about salt water pools, don’t hesitate to ask us!