Need help to start newly filled retiled old pool

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onBalance said:
You are correct about epoxy cement, but I am taking the position that I don't know for sure that the grout is epoxy and not regular tile grout. Of course, tile, vinyl, and fibreglass pools are not affected by aggressive water. But I have to admit, I am never comfortable with the water being aggressive.
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Thanks for the opinion onBalance.
 
mgtfp said:
Yes, I thought about that too, we must have been typing in parallel.

Just that with your pump you will not be able to drain below the skimmer. Or do you have a separate suction port where you can can pump from without pulling water from the skimmer?

Be very careful, don't go away or get distracted when doing that. Set timers. Make sure the pump doesn't run dry.

Ideal for draining are sump pumps, so you don't risk running your expensive pool pump dry.
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:giggle: Yea, got the idea after reading this forum. Thanks for those important advise mgftp. No, the pool doesn't have a separate suction port, but we've been using an Ozito sump pump. It's good enough for the job.
 
Before you start adding anything: Have you read my post from this morning? This decrease from 250 to 90 just from rain doesn't make sense to me at all.
 
mgtfp said:
Before you start adding anything: Have you read my post from this morning? This decrease from 250 to 90 just from rain doesn't make sense to me at all.
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Yes I did read your morning post, thank you! This made me check my record again. It looked to me that I wrote on my note CH 250 as a target. My oriignal CH was 140, added 4kg Calcium Chloride to 170 and planned to add 4kg to increase it to 210 but rained (found 4kg bag is still unopened in garage, .. so much stuff up haha😄. So, the correct result was: before rain CH was 170, after rain it dropped to 90, is this more plausible to you?
 
mgtfp said:
Secondly, your salt would have seen the same change then. You would have needed a salt level of nearly 9000 to come down with the same dilution factor as CH to 3200.

I suspect a testing error. Have you maybe used a 10ml sample and then multiplied the drop count with 10 instead of 25?
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Thanks for pointing this out too!...My note keeping error (again) : salt before rain was 4000 after rain 3200.
 
minidolphin said:
Yes I did read your morning post, thank you! This made me check my record again. It looked to me that I wrote on my note CH 250 as a target. My oriignal CH was 140, added 4kg Calcium Chloride to 170 and planned to add 4kg to increase it to 210 but rained (found 4kg bag is still unopened in garage, .. so much stuff up haha😄. So, the correct result was: before rain CH was 170, after rain it dropped to 90, is this more plausible to you?
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No, still not really plausible. The CH basically halved. To do that, half the pool needs to get drained and refilled with water that contains no calcium. I just don't think that's possible with rain in such a short period.

Either the previous or the current test must have been wrong. I'd suggest that you retest CH to confirm the value before adding calcium chloride.

It's enough to use a 10ml sample where each drop counts for 25ppm.
 
mgtfp said:
suspect a testing error. Have you maybe used a 10ml sample and then multiplied the drop count with 10 instead of 25?
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I willl make sure to check twice on the volume next time
mgtfp said:
Or the latest rain hadn't been mixed in yet properly, and you have tested mainly rain water sitting on top of the pool (rain water has lower density than salty pool water and floats until mixed in). Make sure that the pump has run for a couple of hours before testing after rain.
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Thanks for the advise. I ran the pump before testing
mgtfp said:
And just a hint:

For the CH test it's generally sufficient to do the test with a 10ml sample and multiply drop count with 25.

Only the TA test I would do with a 25ml sample and multiply drop count with 10.
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Great hint mgftp, so to opt for 10ml CH test do I reduce the amount R-0010 drops (8 drops instead of 20 drops)? Also when doing the 10ml FC test I used 1 dipper of R-0870 instead of 2 dipper? The sample turns pink already with 1 dipper.
 
mgtfp said:
No, still not really plausible. The CH basically halved. To do that, half the pool needs to get drained and refilled with water that contains no calcium. I just don't think that's possible with rain in such a short period.

Either the previous or the current test must have been wrong. I'd suggest that you retest CH to confirm the value before adding calcium chloride.

It's enough to use a 10ml sample where each drop counts for 25ppm.
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Thanks mgftp. I will do another test with 10ml sample,.... and 8 drops of R-0010? Also, I collected a jar of sample water this morning, kept it inside the house till this evening. Can I still use that morning sample water to test? because I am already adding CYA in the pool now.
 
10ml of pool water, 10 drops of R-0010, 3 of R-0011, and then each drop of R-0012 counts for 25ppm.

If the sample was in a closed bottle, then it should be fine, I guess.
 

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mgtfp said:
10ml of pool water, 10 drops of R-0010, 3 of R-0011, and then each drop of R-0012 counts for 25ppm.

If the sample was in a closed bottle, then it should be fine, I guess.
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Thank you mgftp, you saved my life:smile:! The test just now shows CH 200:goodjob: Do you think I still have to add 4kg of Calcium Chloride to increase it to 270?
 
mgtfp said:
10ml of pool water, 10 drops of R-0010, 3 of R-0011, and then each drop of R-0012 counts for 25ppm.

If the sample was in a closed bottle, then it should be fine, I guess.
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Wow! Thank you so much for that link mgftp, precise and detailed. I wouldn't have come accross it otherwise.
 
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If your tile grout really is 100% epoxy, then you should be OK. But I am with onBalance's here, that it's not really worth the risk, and I would bring CH up with the 4kg that you have.
 
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