Can I get help to change my salt water pool to fresh water?

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corrado95

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Jul 16, 2018
47
Pran Buri
Now and then i have problem with black algeas and that is terrible to treat. I have an idea to change my pool to a fresh water pool since it seems easier to hold chlorin high.
My pool is 43 cubic meter and temperature is normally about 30-34 C. I have had to add 25 kg salt every 2-3 weeks.
During 2 months I have now used chlorin tablets and TCCA 90% granular. I should like to use TCCA 90% only but I don't know how much I should use and how often. Can you help me?
I have a good test unit so I can test the important things.
 
Last edited:
corrado95 said:
During 2 months I have now used chlorin tablets and TCCA 90% granular. I should like to use TCCA 90% only but I don't know how much I should use and how often. Can you help me?
Click to expand...

TCCA = TriChloroisoCyanuric Acid. Notice the CYA ?

Lets use pucks as an example as its similar. Each puck will raise your CYA 2.9 in 11,300 gallons.

Screenshot_20240216_064425.jpg

Every 10 ppm CYA (3.5 pucks or powder equivalent) you have to raise the FC level to sanitize at the same level. All lines on this chart are considered equal for sanitation.

lc_chart.jpg


It will quickly get out of hand as the FC levels above 100 CYA become unmanageable to maintain. You want to raise the FC a little above target range at a lower FC. Pucks or TCCA are not long term solutions.

What are your current #'s ?
 
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corrado95 said:
My pool is 43 cubic meter and temperature is normally about 30-34 C. I have had to add 25 kg salt every 2-3 weeks.
Click to expand...
Salt does not evaporate with water. It should remain in place. Do you have lots of rain? Does your pool overflow and continue to dilute your water? Do you find that your CYA levels and CH levels are also reducing? Neither of those will evaporate but will be affected by dilution.

What model saltwater chlorine generator do you have?

Can you provide a full set of test data?
FC
CC
pH
CH
TA
CYA
Salt
Pool Temp
 
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HermanTX said:
Salt does not evaporate with water. It should remain in place. Do you have lots of rain? Does your pool overflow and continue to dilute your water? Do you find that your CYA levels and CH levels are also reducing? Neither of those will evaporate but will be affected by dilution.

What model saltwater chlorine generator do you have?

Can you provide a full set of test data?
FC
CC
pH
CH
TA
CYA
Salt
Pool Temp
Click to expand...
Thanks for your help.
I have checked and found that I have used 550kg salt during 18 months. That is 30kg/month. I live in Thailand, we have rain period june-november 6 months. It looks like 25kg/month the dry period and 33kg wet period.
My chlorinator is Emaux SSC15-T
This is my data today:
FC 7
CC 0,5
PH 7,5
CH 180ppm
TA 40ppm
CYA 100ppm
salt 870
26 C

The last 2 months I have used a number of pucks and TCCA, some pucks I have put in the pump so they solved rather quick. Can that explain my high CYA?
What should be the normal use of salt for me if you think this is too high. And why is my use so high. I intend to hold the value about 4000ppm
6 Jan it was 4100ppm and today 870 (no salt added)
 
Thanks for update test data.
With a CYA of 100 your target FC should be 8-13ppm.
Were you able to measure CYA of 100 with dilution test or could your CYA be higher than 100?

Pucks have a predefined amount of CYA that is added. Putting in the pump basket does not affect the quantity of CYA released. However, putting pucks in your pump basket is NOT recommended. When your pump is off, the water becomes highly saturated with low pH and that is not good for your pump. You should also NOT put pucks in your Skimmer basket. If you use pucks then put them in a floater in your pool.

3 test values are ONLY affected by dilution or water exchange - CYA, CH and salt. The salt and CH are low while your CYA is high. Maybe some others have an idea why your use of Salt is so high.

Before adding more salt, I would do a partial drain to lower your CYA to 60-70 and then stop using pucks and TCCA.
After refilling pool, test all parameters again before adding salt, CH, etc.
 
HermanTX said:
Thanks for update test data.
With a CYA of 100 your target FC should be 8-13ppm.
Were you able to measure CYA of 100 with dilution test or could your CYA be higher than 100?

Pucks have a predefined amount of CYA that is added. Putting in the pump basket does not affect the quantity of CYA released. However, putting pucks in your pump basket is NOT recommended. When your pump is off, the water becomes highly saturated with low pH and that is not good for your pump. You should also NOT put pucks in your Skimmer basket. If you use pucks then put them in a floater in your pool.

3 test values are ONLY affected by dilution or water exchange - CYA, CH and salt. The salt and CH are low while your CYA is high. Maybe some others have an idea why your use of Salt is so high.

Before adding more salt, I would do a partial drain to lower your CYA to 60-70 and then stop using pucks and TCCA.
After refilling pool, test all parameters again before adding salt, CH, etc.
Click to expand...
It is a problem for me to a drain because we have a weak water pump from our area well. I can try to do it very slow.
Yes I did the dilution test and it was 100, not higher
You are correct about the pump, it is more noisy now when it runs. Do you have an idea what had happened?
Can I go on with TCCA? If so, how much and how often? Will that higher my CYA? If so, can I use anything else?
It is amazing about my big salt usage. What should the normal use be?
 
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corrado95 said:
You are correct about the pump, it is more noisy now when it runs. Do you have an idea what had happened?
Click to expand...
No. Just watch it and ensure it does not leak or get worst.
corrado95 said:
It is amazing about my big salt usage. What should the normal use be?
Click to expand...
Suggest that if you can do a water exchange since you have a slow feed pump- see below.
Once you can lower your CYA then start fresh and measure everything before you add anything.

Draining - Further Reading

www.troublefreepool.com www.troublefreepool.com
 
corrado95 said:
It is amazing about my big salt usage. What should the normal use be?
Click to expand...
Are your reagents still within the used by date? You may wish to purchase a newer bottle and verify your old test.

I read on the forum that members use 40-120lbs annually to top up after winter or when opening pool. Each pool is a little different. In the USA, salt comes in 40lb bags (18kg) so adding about 60-80kg annually.
But I know Thailand has much more rain so it may be higher for you.
 

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HermanTX said:
Are your reagents still within the used by date? You may wish to purchase a newer bottle and verify your old test.

I read on the forum that members use 40-120lbs annually to top up after winter or when opening pool. Each pool is a little different. In the USA, salt comes in 40lb bags (18kg) so adding about 60-80kg annually.
But I know Thailand has much more rain so it may be higher for you.
Click to expand...
To measure salt i have an instrument. I wrote that I use 25 kg with no rain and 33 with rain. The last 2 months, 2 times rain
 
corrado95 said:
Do I have a slow feed pump?
Click to expand...
I was just referring to what you stated "It is a problem for me to a drain because we have a weak water pump from our area well. I can try to do it very slow."

Maybe I misinterpreted your statement. In a no drain water exchange, the inflow must balance the outflow. Such as you suck water from the bottom of the pool and you add water to the top.
 
corrado95 said:
To measure salt i have an instrument. I wrote that I use 25 kg with no rain and 33 with rain. The last 2 months, 2 times rain
Click to expand...
Has your instrument been calibrated?
Maybe try this. This is what my calculations states
Add 10 grams of salt to 5 liters of plain water - the salt concentration should be about 2000ppm
 
HermanTX said:
I was just referring to what you stated "It is a problem for me to a drain because we have a weak water pump from our area well. I can try to do it very slow."

Maybe I misinterpreted your statement. In a no drain water exchange, the inflow must balance the outflow. Such as you suck water from the bottom of the pool and you add water to the top.
Click to expand...
ok I see, that is not the whole picture. I have 2 tanks together 2400 litre, when they are filled I can take water out and I can use a submersible pump 11,5m3/h. Same pump I can use to take water out from pool
 
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HermanTX said:
I was just referring to what you stated "It is a problem for me to a drain because we have a weak water pump from our area well. I can try to do it very slow."

Maybe I misinterpreted your statement. In a no drain water exchange, the inflow must balance the outflow. Such as you suck water from the bottom of the pool and you add water to the top.
Click to expand...
But I have 2 tanks together 2400 litre. And I have a submersible pump 11,5 m3/h which I can use in pool and in tanks, I have started today.
 
corrado95 said:
Is Sodium hypochlorite 10% what I should use
Click to expand...
That's good stuff.
corrado95 said:
How much could I start with and how much and how often after that?
Click to expand...
Download PoolMath and set up the basic pool details. When you test daily to see how much FC you need today (because of yesterday's loss) plug into poolmath that you want 4(?) ppm and it will tell you to add a little under a half gallon of 10%. The daily demand changes throughout the season with little at the beginning and end and more in the middle. It's a moving target depending on how much you're losing. You want to remain free and clear above minimum for your CYA at all times

lc_chart.jpg
 
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Newdude said:
That's good stuff.

Download PoolMath and set up the basic pool details. When you test daily to see how much FC you need today (because of yesterday's loss) plug into poolmath that you want 4(?) ppm and it will tell you to add a little under a half gallon of 10%. The daily demand changes throughout the season with little at the beginning and end and more in the middle. It's a moving target depending on how much you're losing. You want to remain free and clear above minimum for your CYA at all times

View attachment 554919
Click to expand...
I go o Poolmath but I don't see anything to download??
 
It's in the app store / Google play. If you already downloaded it, run it and it'll walk you through setup. Then click on any parameter, say FC to select your reading, target, and chlorone of choice.
 
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corrado95 said:
I go o Poolmath but I don't see anything to download??
Click to expand...
There is a online version but also one on either Google Store or Apple Store - it costs $8 for the premium version or you can just download the free version. The difference is that with premium version you can maintain all your test data whereas the free only allows you keep the latest test results.
PoolMath
 
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