Can I check fc an hour after adding chlorine to make sure I’m in range?
Or is that a waste of testing drops?
Or is that a waste of testing drops?
Converting to chlorine from PermaSalt
- Thread starter cm35
- Start date
Can I check an hour after topping off bleach I added according to pool math to make sure it’s where it needs to be?
- Jun 1, 2018
- 16,007
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Yes- its a good idea occasionally if you think you may have degraded chlorine.
Not necessary after each addition though.
- Jun 1, 2018
- 16,007
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Are you a frequent user of clarifiers? If so you may be due for a deep clean of your sand.
www.troublefreepool.com
Deep Cleaning a Sand Filter
This post will walk you through the anatomy of a sand filter, and then provide a video at the end for how to deep clean your sand filter. The filter used in the photos and videos is a Hayward S180T top mount sand filter. The images are of a similar filter. Obviously not all filters are...
www.troublefreepool.com
So I’ve always been animing over my estimated cya level for SLAM that I’ve tested several times and just now still fell short again. I dosed up an hour ago to get to a FC/cya level of 70 which is 28ppm, but my actual cya tests have read at about 60 and that’s 24ppm.
Just now tested at 23.5 ppm. Target was 28.
It’s always falling short from calculations in Poolmath. I’m missing something.
I have the % correct in the field. Pool gals. Vinyl. CH. PH. TA. Cya. Fc current and target.
My target has always been 4ppm over by jumping to next cya level calc.
But if this error remains constant then I can predict it hopefully.
Or, my cya estimate is correct at 60 and I’m wasting chlorine by going over the 4ppm to next cya level.
Just now tested at 23.5 ppm. Target was 28.
It’s always falling short from calculations in Poolmath. I’m missing something.
I have the % correct in the field. Pool gals. Vinyl. CH. PH. TA. Cya. Fc current and target.
My target has always been 4ppm over by jumping to next cya level calc.
But if this error remains constant then I can predict it hopefully.
Or, my cya estimate is correct at 60 and I’m wasting chlorine by going over the 4ppm to next cya level.
I replaced sand 10 days ago.Are you a frequent user of clarifiers? If so you may be due for a deep clean of your sand.
Deep Cleaning a Sand Filter
This post will walk you through the anatomy of a sand filter, and then provide a video at the end for how to deep clean your sand filter. The filter used in the photos and videos is a Hayward S180T top mount sand filter. The images are of a similar filter. Obviously not all filters are...
Ok everyone…… just tested fc after 2 hours from a confirmed 23.5 and I’m down 4.5 fc in 2 hours to 19 again.
(Target was 28 (cya 70) but that was me shooting to next cya level and it always lands me on 24 (cya 60 which is actually correct for my tested cya level)
So I’ve been dosing for CYA 70 which is 28ppm FC
but it always gets me to 24ppm FC which is a CYA 60 amount.
Now looking at my notes this is a recurring event almost exactly. Sort of……..
23.5 ppm last night 10:00pm
Down overnight to 13ppm at 6:30am test.
Dosed up 2.5 gals 10% to a target of 28.
19ppm at 10:30 am test.
Dosed back up to 28ppm
23.5ppm at 12:15pm test
-seemed good
19ppm at 2:15pm test-
ready to add back up
Keep in mind I’ve been dosing for a 28ppm level instead of 24 because dosing for 28 has been yielding my true target of 24ppm. (based on actual cya test)
Maybe to soon but I’m seeing 23.5-13-19-23.5-19
The 13 was longer period between tests from sleeping. Silly humans.
I’m using the cya-fc chart and pool math page to calculate chlorine.
Am I close to anything.
Bueller???
Bueller???
(Target was 28 (cya 70) but that was me shooting to next cya level and it always lands me on 24 (cya 60 which is actually correct for my tested cya level)
So I’ve been dosing for CYA 70 which is 28ppm FC
but it always gets me to 24ppm FC which is a CYA 60 amount.
Now looking at my notes this is a recurring event almost exactly. Sort of……..
23.5 ppm last night 10:00pm
Down overnight to 13ppm at 6:30am test.
Dosed up 2.5 gals 10% to a target of 28.
19ppm at 10:30 am test.
Dosed back up to 28ppm
23.5ppm at 12:15pm test
-seemed good
19ppm at 2:15pm test-
ready to add back up
Keep in mind I’ve been dosing for a 28ppm level instead of 24 because dosing for 28 has been yielding my true target of 24ppm. (based on actual cya test)
Maybe to soon but I’m seeing 23.5-13-19-23.5-19
The 13 was longer period between tests from sleeping. Silly humans.
I’m using the cya-fc chart and pool math page to calculate chlorine.
Am I close to anything.
Bueller???
Bueller???
So I think I’m seeing a loss of 4-4.5 every 2 hours?!?!
Maybe too soon to tell.
Could it be I’m dosing too high and overshooting my true cya level and that the chlorine above cya level is vanishing from not being stabilized?
Like the cya is full and can’t hold any extra chlorine?
Weird way my mind thinks
Maybe too soon to tell.
Could it be I’m dosing too high and overshooting my true cya level and that the chlorine above cya level is vanishing from not being stabilized?
Like the cya is full and can’t hold any extra chlorine?
Weird way my mind thinks
So this time after my 19 reading I dosed for a cya level 60 which says 24 ppm vs cya level 70 and 28ppm. I’m just going see how this 4ppm loss presents itself.
So I adjusted with pool math and it told me 90oz of 10% chlorine to get from 19 to 24.
Another thought was that my cya could be closer to 50 in which case it could be taking the extra to get to my target based on faulty data ie bad cya test number. 50 instead of 60 and why the top end is dropping so rapidly. I’m outrunning the stabilizer.
So I adjusted with pool math and it told me 90oz of 10% chlorine to get from 19 to 24.
Another thought was that my cya could be closer to 50 in which case it could be taking the extra to get to my target based on faulty data ie bad cya test number. 50 instead of 60 and why the top end is dropping so rapidly. I’m outrunning the stabilizer.
Just tested at 4:10pm and I’m at 22ppm. So I’ll call that good for now.
The dose at 2:15 was 90oz of 10% for a test of 19ppm to get back to 24ppm.
Tested now at 4:10 and I’m at 22ppm.
So the lower amount is maybe working. I’ll keep an eye on it.
The dose at 2:15 was 90oz of 10% for a test of 19ppm to get back to 24ppm.
Tested now at 4:10 and I’m at 22ppm.
So the lower amount is maybe working. I’ll keep an eye on it.
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Saturn94
Bronze Supporter
- Mar 11, 2015
- 1,864
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
I haven’t seem it mentioned, but other possibilities are your pool is larger than you think, or your chlorine isn’t as potent as indicated on the label.
Have you tried checking chlorine 15-30 minutes after adding to see if it measures closer to your target?
Have you tried checking chlorine 15-30 minutes after adding to see if it measures closer to your target?
That’s exactly what I’m doing now. I’ll report back.
It’s 24’ x54” as they say but it’s has 48” of water.
So truly 24 x 4
So, now that you mentioned it.
The PoolMath page at the bottom calculated 24’round by 4’ deep as 13,500. Not 14,000. So 500 off.
Is that very significant??
Saturn94
Bronze Supporter
- Mar 11, 2015
- 1,864
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
So far new numbers are holding.
Pool math is pretty close.
We’ll see about overnight testing coming up.
Pool math is pretty close.
We’ll see about overnight testing coming up.
So it’s been holding at 21.5 for several hours now. Last dose at 6:15pm for a 24 target. At 8:15pm it’s 21.5.
I was gonna reply that I don’t understand your thing about using 70ppm for the CYA even though the test showed 60ppm. But if the FC is finally starting to hold, thats great news.
So disappointing this morning. Fc dropped 4.0ppm overnight. Pump on high. Same thing.
Essentially zero CC.
This is getting expensive.
This morning I have some small debris from wind like a few leaves and some tree ants flying in. But no visual indication of anything growing. Less than a handful. A tiny amount but the way this is going I want to get it all out. I scooped that out with the leaf net made for running along the bottom. I had sprayed it off over and over with bleach for couple days. So it should be safe. In the beginning last week when I ran it up I had everything in the water to sanitize. Poles. Brushes. Vac brush. Hose filled with chlorinated water rolled up and weighted down by vac brush. Adapter for hose skimmer. Have brushed everything to death.
No steps in pool since last Thursday. Bought 15 gallons bleach Friday. Down to 6 as of now. Pool brought back up to 20-22 ppm.
Essentially zero CC.
This is getting expensive.
This morning I have some small debris from wind like a few leaves and some tree ants flying in. But no visual indication of anything growing. Less than a handful. A tiny amount but the way this is going I want to get it all out. I scooped that out with the leaf net made for running along the bottom. I had sprayed it off over and over with bleach for couple days. So it should be safe. In the beginning last week when I ran it up I had everything in the water to sanitize. Poles. Brushes. Vac brush. Hose filled with chlorinated water rolled up and weighted down by vac brush. Adapter for hose skimmer. Have brushed everything to death.
No steps in pool since last Thursday. Bought 15 gallons bleach Friday. Down to 6 as of now. Pool brought back up to 20-22 ppm.
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