why does my salt water pool turn green

Even the best maintained pool can turn green, through no fault of the pool owner. Perhaps you had a very heavy rain that deluged the pool, or maybe the leaf buds off of the tree ate up all the chlorine. If your saltwater pool turns green, it is important to get it turned around quickly. In this article, we discuss how to handle this situation. When your salt pool goes green, your pool develops a very high "chlorine demand". The "chlorine demand" of a pool is the amount of chlorine that it will take to burn up all of the organic material in the water and leave a chlorine residual in the pool to burn up any other organic material that might get into the water. When a pool turns green, it creates a very high chlorine demand. If you have a 20,000 gallon pool and it turns green, you probably need five lbs of chlorine to turn it blue again. Then you will probably need to hit it with another shock treatment the next day. If your 20,000 gallon pool turns green and has algae growing on the walls, it will probably require twice that amount (10 lbs) to burn up the algae in the water and on the walls. 1 lb of shock per 10,000 gallons - clear water but less than 1. 0 ppm chlorine
2. 5 lbs of shock per 10,000 gallons - green water, no visible algae on walls 5. 0 lbs of shock per 10,000 gallons - deep green water, visible algae on walls Note: If you have a colored surface on your pool, spend a little extra and buy the fast dissolving shock. The less expensive calcium based shock can leave a white film on your plaster over time. No salt system is capable of delivering this much chlorine this fast. The "superchlorinate" function on your salt system simply turns the system up to 100% production, but there is no way by industry definitions that this even comes close to superchlorination. If you have green water, there is algae growing on the walls, even if you cannot see it. You need to brush the walls, seats and steps vigorously to expose any algae to the chlorine shock in the water. Until all the algae is removed, you will not be able to return to depending solely on your salt system for your chlorination. Here is the thing: If you let the chlorine level drop to zero, the algae will start to grow again and you will end up right where you started. When it comes to algae, you have to keep your foot on its throat, so to speak, until it is totally gone.


Your pool will have a raised chlorine demand for some time, and you need to keep testing and shocking as needed to meet that chlorine demand. When your testing shows that your salt system is able to meet the demand and maintain a good residual of 1. 0 - 3. 0 ppm in your pool, then you can stop this emergency shocking and brushing. If you can't figure out how you got there, you will probably find yourself there again, and rather quickly. Organic Matter - this might be a lot of dirt washing into the pool, or buds falling off of the trees, or algae that grew because the chlorinator failed to keep up. Cell Failure - your salt cell has a lifespan of approximately 10,000 hours. Salt System Failure - there could be another component of the system that fails, causing the system to not turn the cell on. This could include flow sensor failure, or a control box malfunction. Salt System Undersized - you might have a system that works fine 10 months out of the year, but when in the extreme heat of Texas summer, it just cannot keep up. In this case you might have to supplement with chlorine tablets or run the system longer. Salt System Not Set High Enough - you may just need to turn the output of your cell up to match the demand of the pool. Pool System Not Running Long Enough - your saltwater chlorine generator cannot generate chlorine if the system is not running. You may need to extend your run time to allow the salt system more time to generate chlorine If you cannot figure out why your salt system is not keeping up with your pool, you may need to bring in a pool professional, who has experience in dealing with these issues. If you are on our Proactive Seasonal Maintenance Program, one of our professional pool technicians will be at your pool twice a year to perform this service. This includes service and evaluation of your salt system. You can take advantage of this opportunity to ask him any other questions that you might have. NEED HELP? Having problems with your salt system? Would you like to install a new saltwater chlorine generator? Contact Pool Stop today! Give us a call at 972-772-4545 to ask questions or set up an appointment OR hit the "Request Info" button and fill out a service request form so we can schedule your service call.


Our team of experienced, licensed professionals is available to help you with expert advice, repairs, and installation. The green colour is algae, which contains the green pigment chlorphyll. The more algae in the water the greener your pool. PAlgae growth is normally prevented by a sanitiser, most commonly chlorine. So when your pool goes green the problem is somehow connected to the chlorine, but as we ll see the details aren t quite so simple. For the most part, salt water chlorinators and bleach pump pools both add chlorine to the water at a constant rate. Unless you re changing the settings on the equipment the amount of chlorine being made available or added doesn t change. So why does you pool go from crystal clear water to green on its own? A fixed dose of chlorine will kill a fixedPvolume of algae, if the pool water changes to increase the rate at which the algae grows it can exceed the rate at which the fixed amount of chlorine can kill it. Once the growth rate exceeds the kill rate the pool will go green. Increased volume of organic material such as leaves or grass clippings in the water that provide food for the algae. Increased use of the pool, which adds sweat, skin cells etc. which will consume chlorine Phosphates (think fertiliser) may be entering the water particularly if your pool is surrounded by grass/gardens. These again provide food for the algae. Increase in water temperature and sunlightPassociated withPwarmer weather will allow algae to grow at a faster rate. In a salt water pool salt (the compound NaCl, sodium chloride) is added to allow chlorine to be produced. When you add a bag of salt into the water sodium chloride dissolves and splits into two separate partsP sodium and chloride ions. Chloride won t kill algae, it needs to be turned into chlorine to do this. This is the job of the chlorinator in your pool. The chlorinator works by passing water past metallic plates and supplying a small electrical charge to convert the chloride into chlorine. Achieving the right amount of chlorine in a salt water pool is hence dependent on a) having a sufficient amount of salt in the water b) operating the chlorinator for enough hours each day to produce the right amount of chlorine and c) having a chlorinator that is operating effectively.


In a bleach or chlorine pool, the chlorine is purchased in drums and added directly to the pool or using a pump on a time clock. Ensuring there is sufficient chlorine in the pool relies on ensuring the drums aren t empty and that the time clocks are set to pump the right amount of chlorine in each day. The right amount of chlorine changes based on the load on the pool per the previous point. In summer when the temperatures are higher you ll need more. If you put a cover on your pool which both limits the waters exposure to UV and keeps leaves out you ll need less. PIf you re busier than usual and you don t take the leaves out as often you ll need more. Chlorine is used as a sanitiser in swimming pools partly because it s effective at a water pH that is comfortable for us to swim in. The effectiveness, or the ability for chlorine to kill the algae is highly highly (think exponentially) dependent on the pH. As the pH moves away from the optimum level the chlorine rapidly stops killing algae. If your pH is sufficiently out of whack, even if it has a level of chlorine that is normally correct,Pyour pool will go green. A green pool can be triggered entirely by the pH moving away from the optimum range. Stabliser is often added to pools to help maintain the right level of available chlorine. Chlorine is broken down by the UV rays in sunlight and so the idea of cynauric acid is that it forms a weak bond with some of the chlorine so that it doesn t all breakdown when the sun is out. In the right doses it works, but when too much is added too much of the chlorine is locked up and can t do its job. Hence you have a pool with an adequate level of chlorine but it still goes green as it s not available to do the job of killing algae. Need help with your green pool? We vePcovered the main causes of green pools. Our next post will be our guide to rapidly restoring a green pool (we ve become experts at this as we onboard new customers) so make sure youPsubscribePto our mailing list to be notified when it s published. Alternately for a free site visit and to learn about our automated pool management system that will mean you never have to deal with a green pool again!

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