Balance as Prep for SWG system

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
Here are my current #s
FC 3
CC 0
TC 3
PH 7.4
TA 100
CH 230
CYA 46
Temp 83

I will be converting to an SWG system and am looking for where to start. I know where the numbers should be for the salt system .. based on Pool School and other posts, but where do I start. Add salt first? Get salt to correct level, and than adjust other chemistry. ?
 

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
Actually, the Pool School "Balance for SWG" is pretty specific here on what order to attack it. My concern is that the numbers specified by the SWG manufacturer state different goals. Which should I follow the manufacturer or TFP. I am inclined to follow TFP for all except the salt level. The unit id the Circupool RJ45. Here are the differences:

CYA: MfR 30-60 TFP 70-80
PH: Mfr 7.2-7.8 TFP 7.5-7.6
TA: Mfr 100-200 TFP 60-90
CH: Mfr 200-300 TFP 50+ for vinyl

Your thoughts?
 

benavidescj

LifeTime Supporter
Apr 27, 2010
431
Fleming Island, FL
You should not be too concerned with the differences or which one to chose. Both sets of numbers are personal preference and neither will hurt the SWG. For example, CYA has no effect on the corrosiveness or scaling potential of the water so the SWG could care less. For a SWG it is recommended that you go into the 70 - 80 ppm range simply to save money on energy and to save on cell life. Ph, not a whole lot of difference between the two recommendations and you will find yourself floating throughout both ranges from time to time. TA, in my experience with my SWG it needs to be lower than what is being shown by the mfg because the SWG tends to make the pH drift up. Mine is around 70, I have a SWG, and it still goes up. It would go up a lot faster if my TA were anywhere near where your mfg is saying. CH, is one that I cannot speak to and maybe one of the experts can chime in.
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
I agree with benavidescj: Do the higher (TFP) CYA and the lower (TFP) TA for sure.

Your current CH is fine where it is based on both recommendations, so don't worry about it.

For the upper limit on pH for TFP you put 7.6. It is really 7.8, which makes the option:

  • PH: Mfr 7.2-7.8 TFP 7.5-7.8

Your pH will rise, so with the TFP recommendation you just don't bring it as low when you add acid. I prefer this personally, and actually keep mine up around 7.8 all the time.

ETA: As for the TA, it will fall on its own with regular additions of muriatic acid for pH. There is really no hurry to do this before going SWCG.
 

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
This is what is listed under Pool School for balancing your SWG:

Adjust your pH to 7.5-7.6 and not any lower. Monitor your pH and when it climbs to 7.8 add acid to lower it back to 7.5-7.6 (This is also IMPORTANT!)

Though, I do see a lot of posts of people that keep it at the higher 7.8 #.
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
I shouldn't be giving advice to a Yankees fan anyway. :grrrr:

I just went to the recommended levels page for the info. It is really all saying the same thing. 7.5 - 7.8 is perfectly fine. It becomes a function of where your pool wants to be and how much you want to fight it. With borates in my pH likes to be a little high and I stopped trying to keep it so low. Just like I try to not get excited when the Red Sox get a 1/2 game lead because I know they are going to be 5 games back at the all-star break.
 

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
I knew my avatar would get me in trouble some day! :cheers:

Bear with me ... I'm still learning .. so I tend to get a bit too locked in on specific #'s.

BTW, I was cheering for Big Poppy to get a hit ...than he did and on the next hit.... I was cheering for him to wake up and run to second base!! :)

I am just a little nervous about converting to the salt system and regretting it.

Thanks for your help!
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
We don't recommend a salt level, you need to use the one recommended by your SWG (they vary).

For the rest, other levels will work, but you will have more stable levels with fewer chances of something going wrong if you follow our recommendations.

The PH will be more stable if TA is fairly low (60 to 70) and PH is around 7.7 to 7.8. Lower PH or high TA will both result in the PH rising more quickly.

CYA around 70 to 80 helps minimize the amount of PH drift and extends the lifetime of your SWG cell.

In a vinyl pool, CH around 50 to 300 are all fine. The only difference between 50 and 200 is the money saved by not bothering to raise the CH level. CH higher than 300 starts to cause some risk of calcium scaling.
 

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
Based on the fact that my CYA is close to 50 right now, should I add stabelizer to get it to 70 when adding salt before starting the SWG? I am using pucks now, but won't get it up to 70 in a week.
 

benavidescj

LifeTime Supporter
Apr 27, 2010
431
Fleming Island, FL
Ah, well since the SWG tends to maintain a more constant level of FC it has been shown that the FC levels when using a SWG can be lower and still keep algae at bay. I like to keep mine up a little from the recommendation just for peace of mind. The recommendation for my pool is 3 - 5 ppm and I tend to keep it 4 - 6. Maybe one of the experts can give you a more technical answer.
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
You want to use muriatic acid. Is is usually cheaper than dry acid and doesn't add anything you don't want (sulphur).

There is a pool school article here. It is a process: cycles of lowering both pH and TA with acid and aerating to bring pH up without raising TA.

Like I said before; you can lower TA purposefully if you want to, but it will come down on its own with regular additions of acid which are needed to keep pH in check. Your choice.

ETA: Just to be clear: you can't lower TA all at once because you don't want your pH below 7.0. It has to be done in steps. Either big steps following the lowering TA instructuions, or small steps with normal acid additions to keep pH in range.
 

richmgreen

LifeTime Supporter
May 26, 2010
163
Central Connecticut
Ok, so I will concentrate on getting the CYA up and than the salt level.

The article says that aeration can be provided by a SWG, fountain, etc. .. how does that happen with a SWG?
 

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