SLAM not clearing the Swamp

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Sierra54

Sierra54

Well-known member
Jul 23, 2014
66
Shawnee/KS
Pool Size
21000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Autopilot Digital PPC1 (RC-35)
I am 4 days into the SLAM process and am seeing no real improvement. Pool is still a green swamp. Before starting the SLAM, I tested everything and adjusted the pH to 7.2, CYA was at 50 and started the SLAM with a FC of 20. The sand filter is reading 0 psi but this has happened before due to the winter freeze. I plan to get a new pressure guage this weekend. I have been brushing and vacuuming but still can only see about 3 feet down. I thought the sand filter may be channeling so I removed the multiport and used a running hose to flush/agitate the sand. This was yesterday and still no improvement.

When I backwash I am getting green water discharge for about 45-60 seconds then it clears. I rinse and return to filter.

At this point, I'm at a loss.
 
How often are you adding back to target FC ?

The more you maintain the FC at or near slam, the quicker it goes, especially at first.
 
Go to 2 hours whenever you are home. The weekend should help. You can dose early to buy the next block of time away. Its great for squeezing errands or a kids soccer game in. Usually by day 2 of hitting it often, the 2 hour drop holds 4+ hours and by Monday its holding 8+ hours and you can easily squeeze work in. (Or mostly in)
 
4 days isnt that long, especially with a sand filter and a green swamp.
+1 on testing and re-adding FC as much as you can.

Just a couple of questions:
- How are you adding FC? Liquid chlorine or something else?
- When did you last test your CYA? I would recommend re-testing that and make sure you have the right SLAM FC target.
 
Keep at it and hopefully your green swamp turns to a blue cloudy swamp soon. Then you just need to keep at it as the blue cloudy pool slowly becomes more and more clear.
 

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Thanks for the replies.

I've opened to a swamp several times. Some even worse. Never had one just not respond like this.
 
No two are the same. Maybe its the green + the warmer temps this year.

You got this.
 
Update...

I opened the pool on a Sunday and this year it took until Friday to see any noticeable changes in the swamp. After Friday, I began to get consistent improvement daily. I finished the SLAM this past Friday so I think I was just shy of 2 weeks to SLAM.

Also, something new I did new this year was to put DE in the sand filter at the end of the SLAM. I think helped prevent issues I've had in previous years with pollen settling in the seams of the liner making me believe I was fighting hidden spots of algae.

This year I again had to jump in a 70 deg pool to clean under the 2 safety covers of the main drains in the deep end. There was quite a bit of algae hiding under the drain covers.

Currently my FC levels are coming down as I am adding CYA. Pool looks good.
 
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