Need encouragement.

[ShelleyAnn]

I am beginning to wonder if we will be able to enjoy actually swimming in our pool or just shocking it continually until we close it in September.

After 3 or 4 days of solid rain I elevated the CL levels anticipating a problem I developed after a hail storm last month. Yesterday I added 288oz (2.25 gal) of chlorine to maintain what I thought was 15.5ppm. I've been using 15,000 gallons for volume per the web site of the place I bought it at, but saw this morning that Mikes calculator has it at 11,430 gallons for a 15 x 30 AG oval, so who knows how high I was actually shocking it. It went like this:

Monday 6pm shocked to 15ppm at sundown
8:20am - 15.5ppm
1:00pm - 12ppm added 104 oz
3:30pm - 13 added 80oz
6:21pm - 13.5 added 56oz
10:24pm - 14 added 48oz
7/12 8:00am - 16.5ppm ...thought my problems were over
3:00pm - 8.5ppm

It looks like my CL went up overnight, but that's probably because I was using the 15,000 gallons to calculate. I can smell the chlorine smell.

CYA 30-35 (I can see the dot better the lower I hold the tube I figured out today)
PH is usually 7.4 I have to add Borax all the time to keep it there.
ALK is 110
Vinyl liner
temp: 78 low in morning to 82 high in afternoon w/ solar panels
water is clear and sparkling. No one has been in the pool for 12 days. Clean baskets regularly. Backwashed 3" from rain Sunday.

Do you think being in Colorado at a mile high makes me burn more CL than everyone else? Is that even more a reason to raise my CYA?

I'm trying to avoid waking up to green water by shocking before I have a problem. I'm wondering if I should let it go green to see if I really do have a problem or am just imaginging it all. Help.

[DavidD]

ShellyAnn,

I'll try to help. If nothing else, I'll try to encourage you.

After 3 or 4 days of solid rain I elevated the CL levels anticipating a problem I developed after a hail storm last month.

What kind of problem did you develop? I'm assuming algae.

Yesterday I added 288oz (2.25 gal) of chlorine to maintain what I thought was 15.5ppm....

.......... I can smell the chlorine smell.

CYA 30-35 (I can see the dot better the lower I hold the tube I figured out today)
PH is usually 7.4 I have to add Borax all the time to keep it there.
ALK is 110
Vinyl liner
temp: 78 low in morning to 82 high in afternoon w/ solar panels
water is clear and sparkling......

How about CC. Are you registering anything above .5 ppm? If not, Other than the chlorine smell (Which could very well be off gassing since it is so high. Maybe Evan or someone can comment) I wouldn't worry. Seams to me, with a CYA level of 35 ppm you will loose a lot of chlorine in the day due to sunlight alone with the level being so high (shock levels). If I understand degradation correctly, it is a curve. Given a set CYA level, You will loose more the higher the FC then the amount lost will lessen as the FC gets lower since the CYA can only "bind" or protect only so much chlorine.You say the water is clear so I think this is yet another reason not to worry.

Do you think being in Colorado at a mile high makes me burn more CL than everyone else? Is that even more a reason to raise my CYA?

You are higher than most of the rest of us but No, not in my opinion. Now if it starts "raining fire in the sky..." then maybe. I'd keep your FC between 3 and 5. That is what works for me. I bring it up to around 4 or 5 ppm at night and after a sunny day and some use it works it's way back down no lower than 2.5. My CYA is also around 35 ppm and the temp ranges from 82 to a whopping 87 on average.

I'm trying to avoid waking up to green water by shocking before I have a problem. I'm wondering if I should let it go green to see if I really do have a problem or am just imagining it all. Help.

Keep an eye on the CC, and you should be fine. Carl always says "Stay Ahead" but don't let it get you soo paranoid that you can't enjoy.

Dave

[duraleigh]

ShelleyAnn,

I am confused by your post and this earlier one:

I finally won. It took tons of bleach also. I was starting to think the way it was smelling was normal, and that I was crazy to think there was something wrong. Well, now on the other side of it, I know that a healthy pool does not smell like chloramines. I just can't believe how hard it was to fight something that wasn't green or cloudy! It would have probably been worse if I didn't respond to the smell. I think brushing and vacuuming was an important factor to finally clearing it up.

What has changed?

I notice your Cl losses are during the day....not at night. Test in the evening and again the next morning....that'll tell you how much you're losing to the Sun.

Yes, I believe your altitude may well have an affect on Cl loss. The UV rays are certainly stronger at higher altitudes.

However, it's still not clear to me why you're not swimming....sorry to be so dense.

[ShelleyAnn]

David D - The problem is that after a hail storm last month I didn't shock and the pool developed that "that chlorine smell" and I ended up dumping in 15 gallons of bleach over 5 days till it held at 15ppm overnight. So this week after all the rain I was trying to avoid a problem. I have not heard of "gassing off" and would be thrilled to hear more. I have never registered a cc ever. Just the smell starts and I know something is different. I've also never heard of degradation, but it makes sense. At this point, I'm going to run with that answer as to why I'm loosing 8ppm in the day. Also, are you saying that people who wake up to algae always have some cc before it happens? I would LOVE a warning like that and then I could forget about the chloramine smell. I guess I've been reading too many posts about the green monster and am more nervous than a cat in a rocking chair factory about it happening to me.

Dave S - We had a ton of rain and I wanted to shock the pool before something took hold like last month. I'm wondering if I'm shocking so high, smell the chlorine "gassing off" and think it's chloramines! I will be thrilled if that is what I'm smelling. Part of my problem is that I test at 10:00pm, add chlorine per the calc, and go to bed. I don't stay up long enough to let it mix and then test again. It's 7:30 here now and the sun is still on the pool. I'm thinking it's in the sun for a full 12 hours a day. I'm not sure exactly what chlorine level I've been getting up to at night because I've always thought I had 15,000 gallons not 11,430. Dave, I would never EVER accuse you of being dense! We're not swimming because I'm trying to maintain 15.5ppm morning noon and night and my daughter likes to drink half the pool when she's in there.

Believe it or not, I think I am feeling hopeful. If cc is all I need to worry about, and if topping off the CL to 5 at night is all it takes, count me in on this pool thing. I just hope it starts to smell better as the CL level gets lower because my husband is real sensitive to it.

[medvampire]

Shelly
I do get the few hints of chlorine form my pool when it is in what I think is great shape. I have had to shock my pool twice this year so far and they were after 3 to 4 in rains because my combined chlorine went above 0.5 ppm. My pool sits under some large oak trees and bugs and other organics end up in the pool after big rains. If the pool looks good, combined chlorine less than 0.5 ppm, or you have a good reason I wouldn’t worry about shocking due to a few hints of chlorine smell.
I would think you would have greater chlorine loss due to uv at your altitude. If people have greater exposure to uv so will your pool.
I am not sure about out gassing being greater but it would depend on the chlorine being in a gaseous state. I know according to Henry’s Law if chlorine were in a gaseous state it would out gas at a higher rate in Denver than in Miami due to atmospheric pressure. I am not sure about the amount if chlorine present in the water in a gaseous form. I agree with Dave might be smelling out gassed chlorine as well.

I do have few questions. How much Borax are you dumping in? What is the ph when you get the chlorine smell?

You have a good ALK so you should not see too much swing in ph and the bleach should cause the ph to rise. I also wonder if the low ph may cause more of the chlorine in the water to reach a gaseous form.
Steve

[CarlD]

Shelly,
I think you are getting good advice here. The excessive UV you are exposed to up there may make you an ideal candidate for running a high CYA pool. There are definite advantages to doing so, that, in your situation, probably outweigh the dis-advantages.

One of the moderators, aylad, runs a high CYA pool very happily since her location normally would also burn off a lot of chlorine.

So if your raise your CYA to the 60-90 level, you'll need to maintain a residual FC of 5 to 10ppm, and shock to 20ppm. On the other hand, once it's established there, you should find yourself maintaining the residual easier with less chlorine smell.

If you decide to do this, my general rec is that you do it slowly--raise CYA to 60 first (it will take a week) and see if you can hold your residual there. If not, go to 70, etc.

I hope Janet (aylad) will step in at this point because she can advise you better than I can.