TL;DR: Just finished my first SLAM as a brand new (to me) pool owner and it was a complete success! For the impatient people, the photos are at the bottom. ![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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This forum and website are great – I’ve read just about everything on here and went from knowing zero about pools other than “they need chlorine” to being much more knowledgeable. And as silly as this sounds, I’m also silently thanking my high school AP Chemistry teacher from 15 years ago (has it really been that long?!?); all that stuff about pH and titrations in the back of my mind was good to know.
My wife and I bought a new house several months ago and it included an in-ground vinyl pool built in 2007, with the original liner. The previous owner said it was 22k gallons, the company that built it told me it was 25k gallons. I’m actually leaning towards 22k based on the numbers I saw during my SLAM but that’s another story.
When I took the top off for the first time a bit over a week ago the water was slightly murky but definitely not the disgusting swamps I’ve seen in a few threads here. Mostly blue, some gunk on the bottom in need of vacuuming, but I could see the main drain in the 8ft section. The walls really needed a good brushing as well. Water temp was 58F according to the heater.
Here’s how my SLAM process went – starting from these numbers (TF-100 test kit w/SpeedStir)
FC 0
CC 0
pH ~7.4
TA 130 (maybe a little high?)
CH 225
CYA 0
71F temp -- we had a warm streak for a few days before I started the SLAM so the pool warmed up nicely. At this point I turned on the heater and set it to 83F since my wife wanted the pool ready ASAP.
I added 8lbs of Clorox brand CYA one evening to bump the levels up to 40, which I verified the next morning. I also dumped in 3 gallons of 10% chlorine and (2) 121oz jugs of 8.25% Clorox, just to see what would happen overnight. The next morning it was slightly less murky and I measured an FC of 0.5 so it ate through that dose of chlorine pretty quickly. I also dumped in another 4 gallons of 10% chlorine, measured a FC level of 4 a few minutes later (!!) and went to work. I wasn’t planning on maintaining the shock level, this was really just a “I wonder what will happen if….” sort of test.
5/2:
Vacuumed and brushed entire pool. Quite the chore, especially having never done it. Stirred up lots of muck so I couldn’t see the bottom to vacuum very well. Spent a LONG time vacuuming to waste so the water level dropped from just under the top of the skimmers to just above the bottom of the skimmers. Had to clean out the pump's basket numerous times since it kept clogging every few minutes.
9:30PM, start SLAM
9:45PM
10:50 PM
11:55PM
5/3
12:20AM
7:45AM
7:00 PM
9:35PM
5/4 (today)
7:15AM
SLAM process appears complete after passing OCLT.
I used 2,304oz of chlorine (2,062oz of 10% chorine from Wal-Mart, 242oz of 8.25% Clorox), including those 9 gallons I used during the "what if...?" curiosity test before 'officially' starting the SLAM. 2,304oz is 18 gallons exactly.
Our pool is absolutely crystal clear. Maybe a few small pieces of dirt/crud on the bottom that are too small to warrant vacuuming right now. I’ll analyze all chemical levels later this evening after work, along with brushing the walls and bottom again. Assuming they're all good, our pool is now open.
And yes, I'm in the middle of installing a fence around it.
If any of you have any suggestions/comments/criticism, don't hesitate to post it. Thanks!
A few before/after pics:
4/26, before starting SLAM:
5/3, approx. 24-hours after starting SLAM
Before second vacuuming
After second vacuuming
5/4, SLAM complete:
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This forum and website are great – I’ve read just about everything on here and went from knowing zero about pools other than “they need chlorine” to being much more knowledgeable. And as silly as this sounds, I’m also silently thanking my high school AP Chemistry teacher from 15 years ago (has it really been that long?!?); all that stuff about pH and titrations in the back of my mind was good to know.
My wife and I bought a new house several months ago and it included an in-ground vinyl pool built in 2007, with the original liner. The previous owner said it was 22k gallons, the company that built it told me it was 25k gallons. I’m actually leaning towards 22k based on the numbers I saw during my SLAM but that’s another story.
When I took the top off for the first time a bit over a week ago the water was slightly murky but definitely not the disgusting swamps I’ve seen in a few threads here. Mostly blue, some gunk on the bottom in need of vacuuming, but I could see the main drain in the 8ft section. The walls really needed a good brushing as well. Water temp was 58F according to the heater.
Here’s how my SLAM process went – starting from these numbers (TF-100 test kit w/SpeedStir)
FC 0
CC 0
pH ~7.4
TA 130 (maybe a little high?)
CH 225
CYA 0
71F temp -- we had a warm streak for a few days before I started the SLAM so the pool warmed up nicely. At this point I turned on the heater and set it to 83F since my wife wanted the pool ready ASAP.
I added 8lbs of Clorox brand CYA one evening to bump the levels up to 40, which I verified the next morning. I also dumped in 3 gallons of 10% chlorine and (2) 121oz jugs of 8.25% Clorox, just to see what would happen overnight. The next morning it was slightly less murky and I measured an FC of 0.5 so it ate through that dose of chlorine pretty quickly. I also dumped in another 4 gallons of 10% chlorine, measured a FC level of 4 a few minutes later (!!) and went to work. I wasn’t planning on maintaining the shock level, this was really just a “I wonder what will happen if….” sort of test.
5/2:
Vacuumed and brushed entire pool. Quite the chore, especially having never done it. Stirred up lots of muck so I couldn’t see the bottom to vacuum very well. Spent a LONG time vacuuming to waste so the water level dropped from just under the top of the skimmers to just above the bottom of the skimmers. Had to clean out the pump's basket numerous times since it kept clogging every few minutes.
9:30PM, start SLAM
- Water @ 78F & pH ~7.4.
- FC 0.5, CC 0.5
- Added 512oz of 10% chlorine to bring it up to shock level, which is 16 according to the chart if you have a CYA level of 40ppm.
9:45PM
- FC 22 (!!)
- CC 2
- The FC of 22 leads me to believe that the pool is closer to the 22k gallon mark, and possibly less than that right now due to having to ‘vacuum to waste’ so much water to get all the crud off the bottom. Water level at this point is about ¼ the way up the skimmers.
10:50 PM
- FC 10
- CC 1
- Added 172oz 10% chlorine
11:55PM
- FC 15
- CC 1
- Added 42oz 10% chlorine
5/3
12:20AM
- FC 15.5
- CC 0.5
- Added 32oz 10% chlorine, went to bed
7:45AM
- FC 17.5
- CC 0.5
- Added 24oz 10% chlorine to maintain levels while I’m at work. Water in the shallow end was mostly clear, the deep end was slightly murky but I could see the bottom drain again. Still some leftover dirt/debris to vacuum out.
7:00 PM
- FC 2.5
- CC 0
- Added 384oz 10% chlorine to bring FC back up to shock level.
- Water in pool was crystal clear upon arriving home from work, with exception of some dirt on the bottom that didn’t get vacuumed up the previous night. Pump has been running nonstop. Both skimmers were almost completely clogged (I added some skimmer socks the previous night and they caught tons of gunk) so I cleaned those out.
9:35PM
- FC 16
- CC 0
- Vacuumed remaining dirt out
5/4 (today)
7:15AM
- FC 16
- CC 0.5
- 81F
SLAM process appears complete after passing OCLT.
I used 2,304oz of chlorine (2,062oz of 10% chorine from Wal-Mart, 242oz of 8.25% Clorox), including those 9 gallons I used during the "what if...?" curiosity test before 'officially' starting the SLAM. 2,304oz is 18 gallons exactly.
Our pool is absolutely crystal clear. Maybe a few small pieces of dirt/crud on the bottom that are too small to warrant vacuuming right now. I’ll analyze all chemical levels later this evening after work, along with brushing the walls and bottom again. Assuming they're all good, our pool is now open.
If any of you have any suggestions/comments/criticism, don't hesitate to post it. Thanks!
A few before/after pics:
4/26, before starting SLAM:
![njRmQEe.jpg](http://i.imgur.com/njRmQEe.jpg)
![dpNTPLz.jpg](http://i.imgur.com/dpNTPLz.jpg)
5/3, approx. 24-hours after starting SLAM
Before second vacuuming
![2izK3jf.jpg](http://i.imgur.com/2izK3jf.jpg)
After second vacuuming
![Xz3BjTd.jpg](http://i.imgur.com/Xz3BjTd.jpg)
5/4, SLAM complete:
![Px7jMl2.jpg](http://i.imgur.com/Px7jMl2.jpg)
![nzxS5kG.jpg](http://i.imgur.com/nzxS5kG.jpg)