About to start turning our green swamp into a sparkling oasis. We normally chlorinate with SWG. My understanding is we don’t need to run it while in the SLAM process. Per the recommendations the CYA needs to be 30-50ppm for non SWG pools. CYA needs to be 70-80 ppm with SWG pools. We are sitting at 30 ppm with the green swamp right now. Given this, which CYA level do you recommend? Why does the Salt water chlorination make a difference in the CYA level?
CYA Question
- Thread starter KCumings
- Start date
- Jun 22, 2014
- 52,018
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Leave the CYA at 30 and SLAM with regular bleach. I like HEB's regular Bravo myself. Bleach is cheap, easy to disperse quickly, and when using the Poolmath Calculator, you can achieve the higher elevations of FC required for the SLAM (CYA of 30 = FC SLAM level of "12"). SWGs simply aren't designed for that process.
After the SLAM, increasing the CYA to 70 for the SWG helps consistently protect the FC produced slowly throughout the day and makes that process more efficient. Hope that helps.
After the SLAM, increasing the CYA to 70 for the SWG helps consistently protect the FC produced slowly throughout the day and makes that process more efficient. Hope that helps.
- Jun 22, 2014
- 52,018
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
I thought they were everywhere. Wow.
Make sure the bleach you buy is unscented and not the splash less stuff. You also want to avoid anything with Cloromax in the name.
- Jun 22, 2017
- 861
- Pool Size
- 35000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45
Be careful of you get Wally world bleach, they changed from 8.25% to 6% bleach, so you'd need to change that in PoolMath for your calculations. They also have liquid shock that is 10% bleach that will work and is cheaper per oz of chlorine.
cfherrman
TFP Guide
- Jun 22, 2017
- 861
- Pool Size
- 35000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45
Part of a chart I made last year, with updated prices. When you factor in how much chlorine is in each container, the liquid shock is much cheaper per ounce of pure chlorine (pure chlorine in it, not per ounce of diluted chlorine)
cfherrman
TFP Guide
I meant 6% 'concentrated' v 6% 'cleaning'
In my store last year the two pack %10 was the same effective price at the 8.25%
In my store last year the two pack %10 was the same effective price at the 8.25%
Have you compared that to current 99% tabs pricing?
I'm in the same situation of getting prepped to SLAM my pool but my CYA is something stratospheric necessitating an 80-100% fill. I have a SWG so I'm going to pull water until I hit around 30 CYA, SLAM, then bring CYA back up to 80.
I'm tempted to SLAM with pucks instead of liquid chlorine because it's less expensive based on what I'm seeing (unless I'm doing it wrong) and I need to raise the CYA back up after my drain/fill anyway (and I'm also at 8.4 pH so tabs can help decrease that, as well).
I'm in the same situation of getting prepped to SLAM my pool but my CYA is something stratospheric necessitating an 80-100% fill. I have a SWG so I'm going to pull water until I hit around 30 CYA, SLAM, then bring CYA back up to 80.
I'm tempted to SLAM with pucks instead of liquid chlorine because it's less expensive based on what I'm seeing (unless I'm doing it wrong) and I need to raise the CYA back up after my drain/fill anyway (and I'm also at 8.4 pH so tabs can help decrease that, as well).
- Jun 22, 2017
- 861
- Pool Size
- 35000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45
The amount of tabs needed to SLAM a pool would make your CYA skyrocket, defeating the purpose of SLAMMING it. Also, I believe they release the chlorine too slowly to be able to keep the levels up with the algae consuming the chlorine. Remember your shock target is dependent on your CYA level, so as your CYA level keeps climbing, your FC shock target is also climbing. You'd end up in a never ending spiral of needing more and more pucks.
By comparison, with liquid chlorine, just pour in enough to hit your shock target, and keep topping it off every couple of hours. Your shock target wouldn't keep increasing this way and bleach very quickly disperses the chlorine and raises the level quickly.
By comparison, with liquid chlorine, just pour in enough to hit your shock target, and keep topping it off every couple of hours. Your shock target wouldn't keep increasing this way and bleach very quickly disperses the chlorine and raises the level quickly.
KCumings and I have to raise our CYA by about 50 points (from 30 to 80 with our SWGs) during or immediately after the SLAM.
The recommended way of doing this is to use liquid chlorine and dry CYA or liquid chlorine and then start using tabs to bring up our CYA until we can switch over to the SWG?
The recommended way of doing this is to use liquid chlorine and dry CYA or liquid chlorine and then start using tabs to bring up our CYA until we can switch over to the SWG?
borjis
LifeTime Supporter
Ya you can't do a tfp style slam with pucks.
I guess you could do non-tfp with bags of shock, but again it's not a good
way as it adds even more cya. And algae will come back again as it
always does when "shocking" instead of tfp slamming.
I guess you could do non-tfp with bags of shock, but again it's not a good
way as it adds even more cya. And algae will come back again as it
always does when "shocking" instead of tfp slamming.
cfherrman
TFP Guide
You definitely want to do it this way and slam with bleach, the tabs add it too slow and will mess with the fc needed to slam the pool, it would be like vacuuming your carpet with very dirty shoes.
You also don't know how much fc you need to slam, making the unintended additions get too high.
I understand the recommendation against using tabs for the SLAM process. My last question was *after* SLAM how we should bring our CYA up to 80. Via tabs or dry CYA?
cfherrman
TFP Guide
If you know what you are doing with tabs and don't mind the slow way, and still test your water it is fine.
Tabs will drop pH and ta
Tabs will drop pH and ta