Refill

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J

Jinxed13

Member
Jun 29, 2022
20
Las Vegas nv
Pool Size
19000
Surface
Plaster
Chlorine
Liquid Chlorine
Morning,
After all the help with determining which direction to go, which was to do a partial refill. I’m wanting to make sure I start right
My last test showed the following

Tc-5
Ph-7.5
Brom-10
TA-160
Cya-stopped at 150
Hardness - well over 600


Pool is draining now (only going halfway or so due to water shortage in Las Vegas)and I plan on refilling tonight

What’s the best procedure to go once refilled?
 
Jinxed13 said:
Yeah. I stopped adding the chemical at that point. There was no reaction
Click to expand...
What testing are you doing for CYA? The test is a turbidity/dot test, where you mix the reagent with pool water 50/50, shake to mix, then put it into a tube and see when the dot viewed from the top disappears. Your mention of adding chemical makes me wonder if you're getting tests mixed up.
 
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To answer your question: Typically you'd re-test CYA, then make sure your FC is dosed correctly, either to maintenance or to SLAM levels if there's a need (FC loss overnight, algae visible in pool, CC is above 0.5, etc.). pH and TA would be tested and adjusted if need be (keep TA at 50 or above for liquid chlorine or SWG chlroination, pH in the 7s).

The reason we're fixated on the CYA is that a CYA of 100+ is very difficult to deal with and keep proper FC levels for sanitation, and realistically it should be down around 30 if you need to SLAM, probably about 50-60 in Las Vegas if using liquid chlorine and no SLAM is needed, or about 70-80 if a SWG is used and no SLAM is needed. We want to be sure you're testing CYA correctly so you know what your target really is and how to reach it.
 
IceShadow said:
What testing are you doing for CYA? The test is a turbidity/dot test, where you mix the reagent with pool water 50/50, shake to mix, then put it into a tube and see when the dot viewed from the top disappears. Your mention of adding chemical makes me wonder if you're getting tests mixed up.
Click to expand...
Confused the tests. I only got half way to the first line before I couldn’t see the black dot.
 
IceShadow said:
To answer your question: Typically you'd re-test CYA, then make sure your FC is dosed correctly, either to maintenance or to SLAM levels if there's a need (FC loss overnight, algae visible in pool, CC is above 0.5, etc.). pH and TA would be tested and adjusted if need be (keep TA at 50 or above for liquid chlorine or SWG chlroination, pH in the 7s).

The reason we're fixated on the CYA is that a CYA of 100+ is very difficult to deal with and keep proper FC levels for sanitation, and realistically it should be down around 30 if you need to SLAM, probably about 50-60 in Las Vegas if using liquid chlorine and no SLAM is needed, or about 70-80 if a SWG is used and no SLAM is needed. We want to be sure you're testing CYA correctly so you know what your target really is and how to reach it.
Click to expand...
Not going in on swg yet. But after reading up on it here it is in my future

So I’ll just refill and add lc per pool calculator
 
Jinxed13 said:
Confused the tests. I only got half way to the first line before I couldn’t see the black dot.
Click to expand...
OK - the halfway mark isn't 150. To test you'll need to do the diluted test. Mix 50/50 pool water with tap water, then use that mix to do the CYA test. Multiply result by 2. If that still doesn't get to 100, then mix 2:1 tap water : Pool water, test, and multiply by 3.

Need to know what your CYA is. It's likely well over 150, as Marty said above, and then you're basically needing to swap out like 75-90% of the pool water to get the CYA where you need it to be.
 
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IceShadow said:
OK - the halfway mark isn't 150. To test you'll need to do the diluted test. Mix 50/50 pool water with tap water, then use that mix to do the CYA test. Multiply result by 2. If that still doesn't get to 100, then mix 2:1 tap water : Pool water, test, and multiply by 3.

Need to know what your CYA is. It's likely well over 150, as Marty said above, and then you're basically needing to swap out like 75-90% of the pool water to get the CYA where you need it to be.
Click to expand...
I’ll do the diluted test this afternoon, but it’s already halfway down. Might as well just keep emptying I assume at this point

Thank you
 
Just keep the plaster wet as you can to avoid damaging it! Refill ASAP too. Plaster isn't meant to be exposed to dry air, is my understanding.
 
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