SLAM Process, High CYA, Incoming Rain

[andrewkrebs]

So, we just got our test kit in to get started with a pool SLAM due to algae on the pool walls.

Last week the pool store said we needed to dilute the pool for high CYA levels (which i didn’t understand at the time, and barely understand now). We dumped about 25-30% of the pool.

Ran the FC/CC/CYA tests today and got 2.4ppm/.4ppm/110ppm. So, it looks like we need to dump about half the pool, should have done that last week it seems.

Anyway, lots of rain coming possibly the next two days. Should we wait till after that or just go ahead and plan to incorporate more rainwater into the mix? Seems like we are starting almost from scratch but with the joy of algae in the pool.

Questions:
1. Is dumping half the pool the right approach for diluting the >100ppm CYA?
2. Should I consider the incoming rain at all in the timing of the dump and refill?

Thanks!

Andrew

 

[reggiehammond]

Dilute your pool water by half and do the CYA test again (simply double the results). Make sure you know where you actually are... Log results in pool math and share them on the forum. Spend the $7 to save results.

You're not going to get feet of rain, so that's of no consequence. Get the CYA test results, then drain to get to 40 CYA. Only then can you properly SLAM Process.

One of the worst things you can do is not drain enough, or try to SLAM at high CYA. Both are just wastes of time and money.

 

[andrewkrebs]

Thanks! Will do!

 

[ajw22]

Is dumping half the pool the right approach for diluting the >100ppm CYA?

First redo the CYA test using the dilution method to better know how much above 100 you are.

For CYA > 90ppm, repeat the test adjusting the procedure as follows:

1. Fill the mixing bottle to the lower mark (15 ml line) with pool water.
2. Continue filling the mixing bottle to the upper mark (30 ml line) with tap water.
3. Shake briefly to mix.
4. Pour off half of the contents of the mixing bottle, so it is again filled to the lower mark (15 ml line).
5. Continue the test normally from adding R-0013, but multiply the final result by two.

If you need to dilute the pool water further then apply these ratios:

Pool water	Tap or distilled water	Multiply result by
1	1	2
1	2	3
1	4	5

Note that when doing a diluted test not only do you multiply the range of the test you multiply the error rate of the test, so results are a ballpark - not an absolute.

Should I consider the incoming rain at all in the timing of the dump and refill?

Nope. The rain does not make a big difference when you need to replace 50% or more of your pool water.

 

[lkrebs]

So, we just got our test kit in to get started with a pool SLAM due to algae on the pool walls.

Last week the pool store said we needed to dilute the pool for high CYA levels (which i didn’t understand at the time, and barely understand now). We dumped about 25-30% of the pool.

Ran the FC/CC/CYA tests today and got 2.4ppm/.4ppm/110ppm. So, it looks like we need to dump about half the pool, should have done that last week it seems.

Anyway, lots of rain coming possibly the next two days. Should we wait till after that or just go ahead and plan to incorporate more rainwater into the mix? Seems like we are starting almost from scratch but with the joy of algae in the pool.

Questions:
1. Is dumping half the pool the right approach for diluting the >100ppm CYA?
2. Should I consider the incoming rain at all in the timing of the dump and refill?

Thanks!

Andrew

Hi!
I am the wife of the OP.
We have now drained 3/4 of our pool. Before we drained, we had a CYA of 160. After putting fresh water in, we now have a CYA of 30. I am attaching a picture of our overall results. Do we really need to add 6 gallons of chlorine?

 

[ajw22]

How many gallons in your pool?

You are using 6% chlorine. Find a source for 10%-12% liquid chlorine/pool shock. Then you will not need so many gallons.

Liquid Chlorine - Further Reading

www.troublefreepool.com

 

[lkrebs]

How many gallons in your pool?

You are using 6% chlorine. Find a source for 10%-12% liquid chlorine/pool shock. Then you will not need so many gallons.

Liquid Chlorine - Further Reading

www.troublefreepool.com

Here is a pic of what I have for shock. We have 33,000 gallons of water.
Is this 12.5% chlorine?

 

[Newdude]

Is this 12.5% chlorine?

Yup. The 'other ingredients' are water.



And Welcome !!!

Whenever you're buying more, check the date code. It'll say 24 200 XXXXX. 2024, day 200. I do simple maths in the store that each month is 30 days. So In the above example of '200', it's almost 7 full months (210). So it was produced in mid July and it's about 1 month old. You want 3 months or less, preferably less, and sometimes have to dig to find better bottles in the back.

 

[andrewkrebs]

Thank you so much!