It is a common mistake to put too much algaecide in a pool. When pool owners see that green, yellow, or brown slime infesting their pristine pool water, they often panic. This results in over-application of algaecide. Sometimes the amount needed is miscalculated and added. Either way, the result is the same.
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Too much algaecide in a pool results in water that is full of tiny foaming bubbles which can damage the filtration system. Too much algaecide can also cause eye and skin irritation. It is recommended to stay out of the water until the algaecide concentration dissipates.
Although adding lots of algaecide is a common and understandable reaction to the growth of algae in the pool, it is an avoidable mistake. Algaecide is not meant for routine treatment, and is in-fact, not the best or most efficient way to remove an algae bloom.
The first thing to do is vacuum the pool manually. Ideally you should vacuum using the waste setting, rather than on filter. In that way the algae that is vacuumed will be expelled from the pool rather than going through the filter and perhaps passing back into the pool.
Vacuuming can take a long time, which is why many pool owners resort to algaecide first. Robotic pool vacuums are not sufficiently robust to detach algae growths from pool surfaces. To get it done right, the pool owner needs to take a couple of hours and get it done by hand.
Brush or scrape down all the sides of the pool, paying special attention to the ladder, around filter boxes and water inlets. Look for cracks and crevices where algae can hide out and bloom later.
Vacuum all areas of the pool, paying special attention to shady areas and discolored areas where the algae is clearly taking hold.
When the entire pool and all equipment has been thoroughly vacuumed and brushed, it is time to apply pool shock, according to the package directions.
You may need to use up to 4 times the amount of chlorine to shock the pool. Also, because sunlight dissipates chlorine quickly, always shock in the evening or overnight to get the full effect of the chlorine disinfectant.
Finally, after chlorine shocking the pool, allow the filter to run continuously for at least 8 hours or until the water is clear. Be sure to clean the filter with a sanitizing cleanser. Unsanitized filter systems can be the culprit of repeat algae blooms.
Check water levels and add balancing chemicals as needed. They are likely to be way out of balance after the algae bloom and subsequent treatments.
Pool ownership is a lot of fun, but it is undoubtedly a lot of work. It is best to keep up on the chemicals, and ensure that the water is receiving enough chlorine at all times. This avoids the problem of large algae blooms. However, every pool owner is bound to experience this problem from time to time.
The best solution is always to clean the algae up thoroughly and start over. This is a lot of work, but results in a usable, sparkling pool much sooner. Using a large amount of algaecide will further exacerbate the problem, and ultimately cause more work for the pool owner.
My top 3 pool cleaning tools
These are the pool cleaning tools I have found the most useful since I have had my pool.
Step and corner vacuum brush
This is a really useful tool for getting into the areas that a standard vacuum head simply cannot reach. Aquatix Pro Pool Step & Corner Vacuum Brush
Leaf rake net
If, like me, you get plenty of leaves at the bottom of your pool then a good leaf rake/net is a must. The Stargoods Pool Skimmer Net gets under the leaves easily.
Robotic pool cleaner
These are quite expensive and it was a number of years before I bit the bullet and bought one. I have never regretted it. The Dolphin Nautilus CC Plus is the most recommended pool cleaning robot on all of the pool forums. It not only cleans the bottom of the pool but also the sides and the waterline.
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Algaecide should be used to prevent algae growing, not to get rid of an algae infestation. If you add it to a pool to try and kill the algae then it will probably not work at all. You should use shock to kill the algae and then algaecide to prevent it reoccurring.
Generally you can swim 15 to 30 minutes after adding a normal amount of algaecide. If you have an algae infestation and have added a large amount of algaecide then you shouldn’t swim until the algae has gone.