The sooner you notice algae and act, the easier it is to get rid of it.
When algae start, the water will have a dull appearance and the chlorine level will fall more quickly than usual. To stop algae at this point, it usually only takes one dose of chlorine to wipe it out.
If you have a major algae problem, several things need to be considered before applying a pool algae treatment
First, algae keep growing. If you are not consistent and continue up to where it is completely gone, it starts growing back.
Miss a day or two, and chemicals you have dosed so far will be wasted. Algae can be hiding in obscure places, like lighting niches or under a ladder or in the plumbing. Continued high chlorine levels will kill all of the algae eventually.
The earlier you stop algae, the easier and cheaper it will be killed. When algae is already well established, a very concentrated chemical attack must be made, and the sooner it will go. All that remains is to make sure you got all of it.
Pool Algae Treatment - Killing Pool Algae
Step By Step (where algae are low in concentration and the pool bottom can be seen)
- Scoop and or vacuum the pool to remove any leaves and other debris. Backwash’ and then ‘Rinse” the filter.
- Super chlorinate (shock) the pool ideally with liquid chlorine to shock level to 20ppm of Free Chlorine using either Liquid Chlorine (1.5L per 10,000L) or Chlorine Granules (310g per 10,000L). Run the filtration system on ‘Recirculate” for 1 hour to allow the chlorine to spread throughout the pool.
- Brush the entire pool everywhere that there are visible signs of algae. (May only need to do so day 1.)
- Monitor the filter pressure and backwash/clean it as needed. Run the filtration system on ‘Filter’ for 8 hours
- Add more Chlorine as required to achieve the 20ppm shock level. Once the algae are dead it will often turn grey or milky white
- It can still take about a week, or more, to clear up the water. You should see an improvement in the water each day. If you don't see this, the algae may not all be gone.
Converting your swamp into a pristine hygienic pool again (Green Pool Solutions)
Just uncovered your pool or come back from holidays, to find “the swamp”?
We have a serious algae problem (even multiple strains) probably with Black Spot, murky green greywater that has provided a haven for water life. NB: Algae can survive high chlorine levels if it has formed A biofilm on its’ surface. (See step 4)
- Clean/backwash the filter, and note the filter's pressure reading is when the filter is clean.
Lower the PH down very close to 7.0 before starting. If the pool has not been serviced for months, all solid matter must be removed from the water by scooping. If you cannot see what is there, proceed with steps 2, 3, and 4 below and wait 24 hours for the suspended matter to precipitate to the bottom.
- If you have a chlorine tablet dispenser or automatic chlorine/ph. the system, you will still need to use another chlorine source for killing off the algae. Super chlorinate as in 2 (section above)
- If you have a sand or DE filter, it is possible to use a flock treatment to clean up the dead algae and other undesirables suspended in the water. Experience tells us that cartridge filters block up immediately and cannot be backwashed thus require specialist treatment techniques.
- Add 1 liter of good quality copper algaecide per 40kl of pool water; this, along with brushing, will remove/break any biofilm on the surface of the algae. Chlorine at high levels will only then be able to kill it. Fill the pool to the brink (as high as possible) as water loss from #6 will be considerable.
- Run the filter on record for I1 hour to mix the chemicals and leave for up to 24 hours to precipitate.
- Carefully and slowly vacuum the pool so as to create minimal disturbance to the sludge on the bottom; with the filter set to waste.
Support Phone a Friend
If this all seems a bit daunting call, Paul, at Pool Assist who will call and inspect the pool and prescribe the necessary treatment, apply an initial dose and quote for the balance of work.
We are happy to “coach” regular clients through the process over a period of time to return the pool to a hygienic and appealing state.