Starting my first SLAM this weekend - a little clueless

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Beth0277

Active member
Apr 22, 2025
40
Morgantown, WV
Hi all -

Losing chlorine from algae (did overnight test). Going to start SLAM tomorrow. CYA is just a hair under 30. Everything else is good, chlorine is really just the issue. Right now it’s about .5. Based on pool math, it says to add 3 gallons of liquid chlorine to start. I’m so worried I’m going to mess something up. Is it relatively safe to do?
 
Show a photo of your pool. A SLAM can last days or over a week.
Depends on how often you test and raise FC back up to SLAM level.
We can guide you.
Do you have a recommended test kit with FAS/DPD testing for FC?
With CYA of 30 your SLAM FC target is 12ppm.
Buy at least 10 gals of liquid chlorine. Turn off your SWCG. Lower pH to 7.2 before starting.
Print out and refer to the SLAM Process often.
What is your current filter pressure. What type of filter to you have?

Ask questions if you are unsure. It has worked for thousands of new members.
 
If you did the Overnight Chlorine Loss Test and did NOT pass then you have algae.
Lower pH by using muractic acid. Use PoolMath app to determine how much to add. Anywhere from 7.2 to 7.4 is fine.

Can you show a picture of your filter? Also an overall shot of the equipment pad, in addition to the photo of current status of pool even though it is clear.

Do you have a ladder or any thing floating in the pool? Remove the floating items and clean them with bleach. If you have a ladder, you need to scub it with a brush if it is not removable.

Don’t hesitate to ask any question.
 
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