Prevent green swimming pool water with HTH pool chlorine. A heavy thunderstorm, buckets of rain, this causes a pH fluctuation and serious dilution of your swimming pool water. This disrupts your pool water chemistry. After all, rain is acidic and sometimes contains a lot of dust, pollen and bacteria from the air. In a normal rain shower this is not a problem if the chlorine, pH, alkalinity and stabilizer are correct.
What are the guideline values for swimming pool water parameter?

- the acidity pH value 7.3–7.4
- the chlorine value
- chlorine: 0.8 - 2.5 ppm
- redox: 600 – 800mV
- the stabilizer cyanuric acid 30 – 70ppm
- the buffering capacity – the alkalinity 80 – 120ppm
These values are not laboratory values, but guide values for a simple measurement of swimming pool water in a private swimming pool.
It goes without saying that we can advise (very) much more detailed values. However, we believe that this is not relevant for private individuals and that this only makes the follow-up more difficult and complicated.
TIP: You can test all these parameters with our 6 in 1 test strips
Most important 2 tips to prevent green water with HTH Chlorine
1. take absolutely care a correct pH
We recommend checking the value very carefully with a Pocket pH meter
We regularly get the comment that the pH value of the customer's swimming pool water is correct. However, if we ask further questions, we notice that measurements are being taken with an expired test kit or old test strips.
So do not measure with old test kits or old test strips, they no longer measure correctly after opening after 1 swimming pool season.
2. Do not use stabilized HTH Chlorine
HTH chlorine sticks and HTH chlorine granulate is a disinfection product for swimming pools WITHOUT cyanuric acid.
This cyanuric acid is in the current chlorine tablets 200g or in cheap chlorine granulate. However, time and time again we see that this causes after a long time an excess of stabilizer – cyanuric acid - and this blocks the operation of your chlorine
Blog topics read tips
From green to blue swimming pool water in 5 steps#from_green_to_blue_swimmingpoolwater_in_5_steps
Below is a very brief summary of how you can make the green swimming pool water beautiful blue, clear and pure again in 5 simple steps with HTH Chlorine.
Step 1 : customize your PH value / acidity to pH 7.3
- if your pH value is too high – basic – add pH minus
- if your pH value is too low – acidic – add pH plus
2nd step : give a chlorine shock with HTH chlorine granulate
- add 150g per 10m³ (10000L) of chlorine powder
- first dissolve the chlorine in a bucket of water and then dose it into your pool
Thirdly : leave your circulation pump CONTINUOUS circulate 24/24 – 7/7
- add chlorine tablets :
- joint HTH Sticks – 300g tablets into the skimmer basket
- Or add Chlorine tablets MTF 5 in 1 into the skimmer
- 1 stick/tablet per 40m³/week
4th step : make your pool water back crystal clear of Flovil Shock – a shock flaker
Step 5: rinse use the sand filter or the cartridge filter every 2 days pool robot daily for extra filtration and circulation.
TIP : you don't know which tablets to use? LEARN ALL ABOUT CHLORINE TABLETS HERE.
The ultimate convenience is automatic water treatment
Does this chemistry sound Chinese to you? We would be happy to advise you on an automated water treatment. These automatic systems relieve you of the swimming pool water treatment.
The automatic pool water treatment systems also work with liquid chlorine - this type also contains no stabilizer. In addition, these systems ensure that a correction is made at the slightest contamination or deviation from the chlorine or pH value.
- Don't feel like cleaning everything yourself? Read all about the 3 coolest Dolphin robots here
- Overview automatic pool water treatment
- Make and keep green swimming pool water clear