SLAM and Overdose

[dereksanders]

For starters, 7300 a gallon above ground pool. Intex SWG, .75HP pump.

Salt: 3,100ppm
Alkalinity: 80
pH: 7.5
CH: 110
CYA: 80
FC: 3.2

Using Taylor test kit 2006 with DPD

We had trouble maintaining FC level and the overnight test had a 1.4ppm loss, so we decided to SLAM. The MathApp said to add 260 oz of 10% liquid chlorine to reach a target of 31ppm, which I did. Upon testing the chlorine level after 60 minutes it’s off the charts and I can’t get an accurate reading. I was using the .2ppm method and quit after 75 drops. I tried the .5ppm method and it too was overdosed. I researched on Taylor, here, and other places and can’t tell if this test can handle that high of chlorine. Does it handle that high of a test or do I need to get a different test? I’m now out of my depth.

 

[JimMarshall]

The FAS-DPD test will handle HIGH amounts accurately, thats why we recommend them.

You added 28 PPM of chlorine to the pool and stopped adding drops at 15 PPM. You didn't overdose anything assuming your CYA of 80 is correct

 

[Bperry]

For starters, 7300 a gallon above ground pool. Intex SWG, .75HP pump.

Salt: 3,100ppm
Alkalinity: 80
pH: 7.5
CH: 110
CYA: 80
FC: 3.2

Using Taylor test kit 2006 with DPD

We had trouble maintaining FC level and the overnight test had a 1.4ppm loss, so we decided to SLAM. The MathApp said to add 260 oz of 10% liquid chlorine to reach a target of 31ppm, which I did. Upon testing the chlorine level after 60 minutes it’s off the charts and I can’t get an accurate reading. I was using the .2ppm method and quit after 75 drops. I tried the .5ppm method and it too was overdosed. I researched on Taylor, here, and other places and can’t tell if this test can handle that high of chlorine. Does it handle that high of a test or do I need to get a different test? I’m now out of my depth.

Dont use the .2ppm method anymore. The .5 is plwnty accurate enough and itll save your test reagents.

 

[dereksanders]

The FAS-DPD test will handle HIGH amounts accurately, thats why we recommend them.

You added 28 PPM of chlorine to the pool and stopped adding drops at 15 PPM. You didn't overdose anything assuming your CYA of 80 is correct

Thanks. I got flustered and did some shoddy math in my head.

 

[dereksanders]

Dont use the .2ppm method anymore. The .5 is plwnty accurate enough and itll save your test reagents.

Thanks for that tip. Appreciate it.

 

[dereksanders]

I believe I found the culprit. After remeasuring levels without teenaged drama everything was correct. To cover all bases I removed the ladder and completely took it apart. Whoever said ladders are a hotel for algae understated the problem. More like a commune. Bleach cleanser, power washing, and good old fashioned UV has it sparkling. I will finish the process as suggested.

I’m delighted my wife found this site. You folks are a wealth of knowledge and a breath of fresh air. Best $7.99 I ever spent. Thanks again.

 

[Newdude]

Whoever said ladders are a hotel for algae understated the problem

Depends on the kind of hotel you're used to frequenting.

Glad it's going well.

 

[dereksanders]

Seeing the light at the end of the tunnel. It’s amazing how apparent clear water isn’t so clean. Yesterday’s overnight loss was 5 and today it was 2. Hoping for a great day tomorrow.

So, someone asks why I’m scrubbing, brushing and vacuuming a clean pool.

 

[Newdude]

It’s amazing how apparent clear water isn’t so clean

Algae is microscopic and it grows exponentially. Those last couple of grwoth cycles are the difference between clear water and full blown swamp.

Regular testing sends you red flags as an early warning system while you still have the upper hand. Clearing swamps is like trying to stop a runaway train, so its strongly recommended you listen to what the pool is telling you.

Youre doing great.

 

[dereksanders]

Ended SLAM on Saturday morning. Overnight chlorine loss this morning is still 0. FC at 15 and slowly coming down.

 

[dereksanders]

Wind storm on Tuesday dumped a ton of debris into the pool. Cleaned and vacuumed the pool yesterday. Zero overnight chlorine loss this morning and still crystal clear.

Trust the process and do the necessities.