I am new here, and have my first swimming pool. I did read the 'Pool school' information, here and looked at many other sites.
I live in Thailand and since 6 weeks I have a new outdoor Fibre Glass pool with integrated spa built.
In total it contains approx. 50,000 litres water. The pool is filled with ground water. I have a SWG system with sandfilter.
Unfortunately my own ‘test tools’ are very limited:
- PH/CL testkit with two tubes where Phenol and Orthotolidne drops must be added (especially the Chlorine level is difficult to read, just guessing).
- a digital PH pen reader (quite accurate)
- test stripsTCl, FCl, PH, TA, TH, CYA (TCl out of range,other readings also not very reliable, I think)
The PH level in the water is always high and I have to add approx. 1,3 liter of HCL weekly.
Then I read on the TFP website about the problem of high concentrations of CYA I started to measure CYA with test strips. The CYA I measured is 150ppm. I was already planning to replace 73% of the the pool water (according PoolMath), but 'just to make sure' I went to have the water tested at a poolshop. There the CYA appeared to be only 11 ppm (tested with a La MotteColorQ PRO7)
As this is quite a big difference I decided to have ‘a second opinion’ and went right away to another pool shop to have the same sample water tested again. At this shop they measured for CYA 6 ppm only. Also other measurements were not in line with first shop. (There they use a La Motte Water Link Spin Lab).
Of course the shops don’t say whether they calibrate the equipment, and whether they use the correct reagents and doing the measurements exact according the instructions. At the other hand they are doing a lot of testing, so it cannot be that worse??
I am investigating possibilities to get my own ‘real’ testkit here in Thailand but it is difficult to get a Taylor or LaMotte test set (‘Restricted items’, import duty and VAT).
My questions:
What is the best to do now?
Which test is true? (the more different figures the more confusion)
Is it possible that the CYA is as low as the shops measured?
As I understand will the CYA always remain in the water. Taking in consideration that since the start up approx. 22 liters of HCL is added, are the low figures of the shops are possible then???
Any suggestions?
Thank you in advance,
Hans
Test results:
I live in Thailand and since 6 weeks I have a new outdoor Fibre Glass pool with integrated spa built.
In total it contains approx. 50,000 litres water. The pool is filled with ground water. I have a SWG system with sandfilter.
Unfortunately my own ‘test tools’ are very limited:
- PH/CL testkit with two tubes where Phenol and Orthotolidne drops must be added (especially the Chlorine level is difficult to read, just guessing).
- a digital PH pen reader (quite accurate)
- test stripsTCl, FCl, PH, TA, TH, CYA (TCl out of range,other readings also not very reliable, I think)
The PH level in the water is always high and I have to add approx. 1,3 liter of HCL weekly.
Then I read on the TFP website about the problem of high concentrations of CYA I started to measure CYA with test strips. The CYA I measured is 150ppm. I was already planning to replace 73% of the the pool water (according PoolMath), but 'just to make sure' I went to have the water tested at a poolshop. There the CYA appeared to be only 11 ppm (tested with a La MotteColorQ PRO7)
As this is quite a big difference I decided to have ‘a second opinion’ and went right away to another pool shop to have the same sample water tested again. At this shop they measured for CYA 6 ppm only. Also other measurements were not in line with first shop. (There they use a La Motte Water Link Spin Lab).
Of course the shops don’t say whether they calibrate the equipment, and whether they use the correct reagents and doing the measurements exact according the instructions. At the other hand they are doing a lot of testing, so it cannot be that worse??
I am investigating possibilities to get my own ‘real’ testkit here in Thailand but it is difficult to get a Taylor or LaMotte test set (‘Restricted items’, import duty and VAT).
My questions:
What is the best to do now?
Which test is true? (the more different figures the more confusion)
Is it possible that the CYA is as low as the shops measured?
As I understand will the CYA always remain in the water. Taking in consideration that since the start up approx. 22 liters of HCL is added, are the low figures of the shops are possible then???
Any suggestions?
Thank you in advance,
Hans
Test results:
| Test | 26-8-2020 | 4-9-2020 | 4-9-2020 | 4-9-2020 | 5-9-2020 | 8-9-220 | ||
| Ideal | shop 1 | test strip | shop 1 | shop 2 | test strip | test strip | ||
| Free Chlorine | FC | 4 ppm | 0,82 | 0,5-1 | 1,25 | 2,61 | 1,00 | 1,00 |
| Total Chlorine | TC | 0,82 | ?? | 1,25 | 2,61 | ?? | ?? | |
| Combined Chlorine | CC | 0 | ||||||
| PH | PH | 7,6-7,8 | 7,30 | 7,20 | 7,5 | 7,7 | 7,7 | 7,8 |
| Alkalinity | TA | 60-80 | 19 | 120 | 24 | 94 | 120 | 120 |
| Cyanuric Acid | CYA | 70-80 | 13 | 150 | 11 | 6 | 150 | 150 |
| Salt | TDS | 4000-5000 ppm | 3170 | 3900 | 4396 | |||
| Calcium Hardness | CH | 350-550 | 25 | 50 | 38 | 53 | 50 | 100 |
| Phosphate | Phos | 0 ppb | 100 | 100 | 100 | |||
| Copper | CU | 0 ppm | 0,81 | |||||
| Iron | FE | 0 ppm | 0,26 |
