CYA Testing

Cool! Especially not fun at 5:30am before work. Just wasn’t sure if there was a reason to continue because of the metals issue.
 
  • Like
Reactions: Newdude
Always smart to ask. (y)

If the metals stain the pool, brushing won't help. It's an entirely different animal than algae dying and needing to be brushed.
 
FC was 7.5ppm this morning, so my total 24 hour loss was 2.7ppm. Addded 32 oz this morning to make sure there is enough. Expected upper 80’s temp and a lot of sun today. Question- I have a pool heater that I only run on weekends for about 12-15 hours total. With the temp only in the upper 50’s/low 60’s at night, my water temperature at the end of the week is about 71 degrees. Ill have the heater turn on at about 3am overnight and by about 3pm Friday it brings it up to mid 80’s. Then run it some more on Saturday to keep it that temp. Will that sudden temp change against the cooler night temps decrease my CYA? Also, that’s why each week I have to add 2-3 inches of water because during the week I’ll lose that much water to evaporation.
 
1. The CYA in your pool should remain relatively stable during temperature fluctuations.

2. 2-3" weekly is somewhat excessive just for evaporation. You may have a small leak, I would suggest you perform the Bucket Test.........do you know how?
 
  • Like
Reactions: kcassidy0772
Will that sudden temp change against the cooler night temps decrease my CYA?
No. Any of the solids (salt, CYA, Ch) stay behind and only water evaporates.

Also, that’s why each week I have to add 2-3 inches of water because during the week I’ll lose that much water to evaporation.
Exactly why. Cooler nights create a larger delta with the still warm water and more evaporation happens. Then if there's a breeze, the --------------- water becomes rippled ^^^^^^^^^^^^ with more surface area for evaporation/ heat transfer to occur.

You should see it fluctuate every block of temp swing. For example, we had 3 cool nights in a row and you should have seen a little more than normal loss. Then the next three nights are 70s and there's much less loss.

You'll get a feel for it after a while but if you question it at any point, try the bucket test Dave mentioned above.
FC was 7.5ppm this morning
Was the color any better ?
 
  • Like
Reactions: kcassidy0772
1. The CYA in your pool should remain relatively stable during temperature fluctuations.

2. 2-3" weekly is somewhat excessive just for evaporation. You may have a small leak, I would suggest you perform the Bucket Test.........do you know how?
Thanks Dave. For now I’m comfortable no leak. I actually went through this last summer with it being my first year with heater. I’ve paid close attention this year so far. When I took cover off about a month ago, I lost nothing over winter. Then continued to see no loss the first couple weeks. The 2 plus weeks since running this heater in this matter is when I’m now seeing these weekly loses. I next expect once we get into consistently warmer weather and my heater usage goes down as well, I should see much less weekly loss, if any at all. Unless of course my wife then tells me she’d like the pool to be 100 degrees. :)
 
  • Like
Reactions: Newdude
More often than not it all balances itself out here. The big storm that hits on a rando Wed night puts the 2 inches you lost back. It needs to be particularly dry or wet for you to step in.

Of course though. Add some water and it pours 2 days later when no storms were on the radar, or wait it out with the pool a little low because the forecast is terrible for the next week and the storms all blow out to sea and miss us completely. :ROFLMAO:
 
  • Like
Reactions: kcassidy0772
No. Any of the solids (salt, CYA, Ch) stay behind and only water evaporates.


Exactly why. Cooler nights create a larger delta with the still warm water and more evaporation happens. Then if there's a breeze, the --------------- water becomes rippled ^^^^^^^^^^^^ with more surface area for evaporation/ heat transfer to occur.

You should see it fluctuate every block of temp swing. For example, we had 3 cool nights in a row and you should have seen a little more than normal loss. Then the next three nights are 70s and there's much less loss.

You'll get a feel for it after a while but if you question it at any point, try the bucket test Dave mentioned above.

Was the color any better ?
lol. I hate that this can’t be measured numerically like everything else. I feel like week to week it’s at least a little less green tinted and I’d even say appears to have more blue. As opposed to just a lighter green tint. I anxiously wait for weekends to come to really see the water in different lights. During the week I’m only home before 6:30am and after 6:30pm. No sun in my backyard in the am and very little in the evening. I like being able to see appearance during all times of the day so I can compare apples to apples so to speak.
 
  • Like
Reactions: Newdude

Enjoying this content?

Support TFP with a donation.

Give Support
More often than not it all balances itself out here. The big storm that hits on a rando Wed night puts the 2 inches you lost back. It needs to be particularly dry or wet for you to step in.

Of course though. Add some water and it pours 2 days later when no storms were on the radar, or wait it out with the pool a little low because the forecast is terrible for the next week and the storms all blow out to sea and miss us completely. :ROFLMAO:
Exactly, and hasn’t been any rain really this past week. I think light showers one night.
 
  • Like
Reactions: Newdude
lol. I hate that this can’t be measured numerically like everything else. I feel like week to week it’s at least a little less green tinted and I’d even say appears to have more blue. As opposed to just a lighter green tint. I anxiously wait for weekends to come to really see the water in different lights. During the week I’m only home before 6:30am and after 6:30pm. No sun in my backyard in the am and very little in the evening. I like being able to see appearance during all times of the day so I can compare apples to apples so to speak.
And...maybe we're back to capturing the last little bits of dead algae floating around, if you are seeing a slow clearing.....as long as your Cl is up enough to not drop too far with no circulation/addition, turning it off and seeing if additional stuff settles out is an easy thing to do...

As noted, pretty much the only time you will see a drop in CYA, CH, salt is if you pump it out and replace with untreated. If a lot of evaporation is allowed, you might see an increase when low, that returns to normal when full - but a few inches is well within the margin of error and unnoticeable in the testing. Mine does that, but I pump out 15-20% of the water each late fall, to be replaced by snow melt and rain.
 
This is probably where I want to be I think?
Much better.

Have some weekend missions for you if the tint is still evident. Go tell the pool store that you're questioning your metals content and the tint cleared for now. Have them test the pool and tap water to see how they compare. If both are high for either choice, then draining and putting it right back in isn't going to help.

Again, ignore anything they push or whatever gibberish they spout. Smile and be polite, decent human rules still apply.

It's easy when they only find one or two things wrong because 'as luck would have it, I have 2 bags of XYZ at home. THANKS 16 year old kid !!!!" (Wink wink). They will find your TA low, they use a different calc and then try to boost it because it's low. On top of that, their target is too high. So either way they'll push TA up. :ROFLMAO:

Also break down the filter and post pics of the carts. Hopefully they have some blue (copper) or brown (iron) to them as another form of identification.
 
Much better.

Have some weekend missions for you if the tint is still evident. Go tell the pool store that you're questioning your metals content and the tint cleared for now. Have them test the pool and tap water to see how they compare. If both are high for either choice, then draining and putting it right back in isn't going to help.

Again, ignore anything they push or whatever gibberish they spout. Smile and be polite, decent human rules still apply.

It's easy when they only find one or two things wrong because 'as luck would have it, I have 2 bags of XYZ at home. THANKS 16 year old kid !!!!" (Wink wink). They will find your TA low, they use a different calc and then try to boost it because it's low. On top of that, their target is too high. So either way they'll push TA up. :ROFLMAO:

Also break down the filter and post pics of the carts. Hopefully they have some blue (copper) or brown (iron) to them as another form of identification.
Yes still tinted. When you say “ tell them I’m questioning my metals and the tint cleared for now”, what do you mean by “and the tint cleared for now”?
 
If they think it's still tinted they have a wall of sequesterants to sell you today. We may end up there but sequesterants are a short fix and need to used permanently so we'd rather fix it one and done if possible.
 
  • Like
Reactions: kcassidy0772

Enjoying this content?

Support TFP with a donation.

Give Support
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.