SLAMing test question

[RTR Deuce]

I swear I read somewhere I can run a diluted test to check FC? I don't want to put over a hundred drops in to test again.

 

[ajw22]

Test with a 10 ML sample and each drop is 0.5. 100 drops would be 50 ppm. 40 drops would be 20 ppm.

Diluting a sample will greatly reduce its accuracy and usefulness.

 

[RTR Deuce]

I went to bed with 23.6 ppm FC and woke up with 7.8

Makes no sense, the pool is spotless to be honest. I'll keep SLAMing until I lose less than 1 ppm and CC is < 0.5

But someone please reassure me this sounds normal.

pH 7.6
CyA 60

 

[ajw22]

It is normal. The SLAM Process can have a long tail until your water is really algae free.

 

[RTR Deuce]

Ok, man. I'm just now realizing I needed to adjust the pH to like 7.2

I found muriatic acid at 31.45% hydrogen chloride but unsure what qty to put in.. the poolmath doesn't seem to have that option available.

 

[mknauss]

the poolmath doesn't seem to have that option available.

Muriatic acid. Same thing as hydrochloric acid.

 

[RTR Deuce]

Muriatic acid. Same thing as hydrochloric acid.

Yes sir, but the highest I see in pool math is 29%.

Is the difference negligible?

 

[ajw22]

Ok, man. I'm just now realizing I needed to adjust the pH to like 7.2

Confirm that your FC is below 10 when you checked the pH. pH test is invalid when FC i above to and should be ignored.

Once you begin the SLAM Process just check FC and CC and occasionally CYA. Ignore pH, TA and CH.

 

[RTR Deuce]

Confirm that your FC is below 10 when you checked the pH. pH test is invalid when FC i above to and should be ignored.

Once you begin the SLAM Process just check FC and CC and occasionally CYA. Ignore pH, TA and CH.

Yes, the pH was 7.6.. I might just put a cup in and give it 20 mins and test pH

 

[ajw22]

Give it 45 minutes and retest pH.

 

[pjt]

I found muriatic acid at 31.45% hydrogen chloride but unsure what qty to put in.. the poolmath doesn't seem to have that option available.

Look for this:

 

[RTR Deuce]

Look for this:

View attachment 354144

I was curious if that was it. But the degree symbol was throwing me off. Thanks.

 

[pjt]

I was curious if that was it. But the degree symbol was throwing me off. Thanks.

That's Baumé.

 

[NowintersinAZ]

You can do the FAS/DPD test with different sample sizes and hence the multiplier is different resulting in a different precision:
5 ml sample... 1 drop=1 ppm
10 ml sample... 1 drop=.5 ppm
25 ml sample... 1 drop=.2 ppm

If you wanting to dilute with tap water it will effect the out come of the test.

 

[RTR Deuce]

You can do the FAS/DPD test with different sample sizes and hence the multiplier is different resulting in a different precision:
5 ml sample... 1 drop=1 ppm
10 ml sample... 1 drop=.5 ppm
25 ml sample... 1 drop=.2 ppm

If you wanting to dilute with tap water it will effect the out come of the test.

Yeah, I realized how stupid that was after I asked the question. I'd normally tested with 25ml but have moved to 10ml for SLAM.

 

[RTR Deuce]

That's Baumé.

Ah, more learning for me. I'll read up on it! Thanks!