SWG switch over numbers

[retfr8flyr]

Well I finished up all my pool equipment upgrades and got my numbers in line to switch over to a salt pool. My numbers yesterday morning were

FC 4
CC >.5
PH 7.6
TA 80
CH 230
CYA 80
Sal 400

I added 300 lbs of salt, per the Pool Math calculations and turned on the SWG, CircuPool RJ-30 Plus, set at 70%, their recommendation, for 5 hours total time. This morning my numbers were

FC 10
CC >.5
PH 8.0
TA 90
CH 230
CYA 80
Sal 4200

I shut off the SWG to let the FC come down a little and added 1 pint of MA to bring the PH down. The salinity is a little high but the SWG seems to like it and it is only reading 3800 on the power unit. I am sure the salinity will come down fairly quickly as I add water, due to evaporation and rain. I will check the FC again in the morning and then decide on the SWG settings. I am thinking about trying 50% for 5 hrs. I am brand new to a salt water pool and I would appreciate any further suggestion from all you experienced members.

 

[mknauss]

You are going about it the right way. Keep adjusting either pump run time or SWCG % to get to the FC you would like.

I test my FC in the morning just before the SWCG turns on. That should be the lowest point your FC will be.

Evaporation does not reduce salinity. Only water removal makes that occur.

Take care.

 

[retfr8flyr]

Thanks for the encouragement. Maybe I wasn't clear on the salinity, the evaporation requires me to add water, which will reduce the salinity. I know the salinity will not change just from evaporation. When you also factor in the rain from the thunder storms in the afternoons, I don't think lowering the salinity will be a problem.

 

[Akathisia]

When water evaporates there is no NaCl in it so the water left behind in the pool has a higher concentration of salt. When you add water back into the pool to the original fill level before the evaporation you will return to your original salt ppm. If more water than usual is added through rain or a garden hose, this will dilute the concentration of salt and lower the salt ppm. If there is overflow or some other kind of drainage you will lose salt with the water and lower the NaCl ppm, but not through evaporation.

 

[domct203]

Well I finished up all my pool equipment upgrades and got my numbers in line to switch over to a salt pool. My numbers yesterday morning were

FC 4
TC >.5
PH 7.6
TA 80
CH 230
CYA 80
Sal 400

I added 300 lbs of salt, per the Pool Math calculations and turned on the SWG, CircuPool RJ-30 Plus, set at 70%, their recommendation, for 5 hours total time. This morning my numbers were

FC 10
TC >.5
PH 8.0
TA 90
CH 230
CYA 80
Sal 4200

I shut off the SWG to let the FC come down a little and added 1 pint of MA to bring the PH down. The salinity is a little high but the SWG seems to like it and it is only reading 3800 on the power unit. I am sure the salinity will come down fairly quickly as I add water, due to evaporation and rain. I will check the FC again in the morning and then decide on the SWG settings. I am thinking about trying 50% for 5 hrs. I am brand new to a salt water pool and I would appreciate any further suggestion from all you experienced members.

I just wanted to point out that I think you have Total Chlorine (TC) and Combined Chlorine (CC). TC can never be lower than FC as TC=FC+CC.

 

[retfr8flyr]

I just wanted to point out that I think you have Total Chlorine (TC) and Combined Chlorine (CC). TC can never be lower than FC as TC=FC+CC.

Thanks for that catch, I have corrected it to CC, which is what I meant. Well today's numbers are

FC 7
CC .5
PH 7.4
TA 70
CH 230
CYA 80
Sal 4100

I like these numbers, so I am leaving the salt cell off for now and will turn it back on tomorrow at 50%. we had a small shower last evening so the salinity is down a little. I will be adding some water tonight, so hopefully the salinity should come down a little more. I would like to eventuality get it down to 3500, which is the recommend level for the SWG, and maintain that level.

 

[mknauss]

I would not turn off the SWCG. You should hold your FC near 10% of your CYA -- for you that is FC of 8. That should ensure you are never below your target of 6.

Be sure to use the FC/CYA chart.