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It may be algae growing under the liner - which is not good. I know that when there is high levels of chlorine in the water it sometimes lightens these stains, but not for long. There is no way to get rid of it except for getting something under the liner to kill it. I know there are some...

As long as you have enough metal sequestering agent in the water, you can start to bring up the chlorine. Do this slowly. Add a cup (or more if you have a large pool) of bleach at a time waiting about 1/2 hour in between each dose until you get up to your minimum chlorine level for the amount...

Hi, I live in the center of the eastern half of PA. I have a fiberglass pool (white, they didn't come in any colors when I got my pool) and I love it. I get lots of freezing and thawing. This is the 9th summer for my pool. I haven't had any problems except for staining, and we know how to...

That sounds right! I would let it go for a couple of days if you have time, then add the bleach, because the bleach will break some of the sequestering agent down. Make sure the ph is low - 7 - 7.2 so the sequestering agent will work better. When you are ready to close, add the chlorine...

Check the trichlor tablets - sometimes they have copper added. Your numbers look ok, expcept the chlorine is too low. You need to keep a minimum of 3 to 4ppms of chlorine with a cya of 50, and the high of 6 - 7. Your shock would be 15 to 20 ppms. I'm not sure if you need to shock with a .5...

I would wait till the spring. If you are using stain #2, then you have a copper stain. Do you know how copper got into the pool water? I have not dealt with copper stain treatments, so I really can't advise - but I would wait till next season, because if don't keep the sequestering up, and...

You can crush up a couple of vitamin C tablets and put them in a sock and rub it on the stain. You can also use ph down in a sock the same way. If it is a mineral (metals) stain it should lift up. Then you can try lowering the ph to 7.0 to 7.2 and using a sequestering agent - new stains will...

A sequesering agent is a chemical that binds with the metals that are in soluton (metals that lift off the surface of the pool after an ascorbic treatment, or metals that are in the water through other means). They usually say "helps control metals" on the bottle. Some of them are : Jack's...

You may want to use some trichlor pucks for a while. They will reduce the ph (they are acidic), and they will add some cya at the same time. Wow, look how much your calcium went up! That's why they don't want you to add the calcium right away. Seems like you are keeping up with everything 8)...

You can try crushing up some vitamin C tablets putting them in a sock and rubbing on the stain. If this lightens the stain, then it is a mineral stain (metals). These stains can be removed with ascorbic acid along with a sequestering agent. When you post your numbers, we will be able to help...

The easiest way, and this may not be what anyone would want to try - is to get very fine sand paper - it cleans it really fast and really easy. I know it may take a light film of the gelcoat off too, but when I had the pool company (from the manufacturer) come to fix some hairline cracks on the...

Fiberglass pools tend to stain very easily. To contol the stains, you have to keep your water balanced, and use a sequestering agent. I know that stains will usually disappear over the winter when the pool is closed. If you don't close your pool, then you need to get rid of the stains using...

I have always dealt with metals in my water since I have a well. This year however, I switched to using Proteams Metal Magic, and had the most stain free year ever. It is supposed to turn the metals into salts so that the salts can be filtered out. I don't know if it is true, but in my own...

No, I wouldn't add any cya right now. 50 is great for you. It will hold the chlorie in sun. The only thing is that with a cya of 50 you need to keep a minimum of 3ppms of chloirne at all times. If it goes lower than 3ppms, your water will be open for soe algae to take hold, so if you keep...

They tell you not to add calcium, because you will get calcium in your pool from the plaster. Calcium leaches out at the very beginning - that is why you have to brush all the time. That's why you wait and see how much is in the water before you start to add. They want you to keep a calcium...

You need to get your chlorine up. You have something eating your chlorine - probably the beginning of an algae bloom. You will have to take your chlorine up to 25ppms for the amount of cya you have, and keep it there testing 3x a day if possible, and at least 2x's bringing the chlorine back up...

It's always so nice to get feedback :cheers: - especially when it's so positive :)

Since the ascorbic acid didn't work, and the stains are not rough, it may be that they are coming from under the liner. I just am reluctant to believe it because the stain from under the liner is usually black, or very dark. If it were my pool, I would take the ph down to 7.0 - 7.2 and add a...

Do the stains come and go? If they do, then I doubt that it is under the lliner. How did you apply the ascorbic acid? Did you ever get a true reading on calcium? If you used the drops to over 600 calcium, then that could be a problem - maybe dirt encapsulated scale. YOu can try rubbing some...

If you post a full set of numbers, we can help, also what you have been using in the water. A good way to check the stains is to crush up some vitamin C tablets, put them in a sock and rub on the stains. If they lighten up it is a mineral stain. You can also use ph down in a sock. To check...

Kill the algae first with chlorine. Post your chemistry numbers and we can help - you shouldn't need more than a nylon brush once the algae is exposed to high levels of chlorine :-D

If it doesn't stop, then check your filter, your laterals may be cracked. You should not have any sand coming back into the pool. If you are losing a lot of chlorine, it may be algae. Mustard algae looks like sand. If you pick it up and rub it between your fingers and it feels slimy, it is...

All you need is to take your chlorine up to I would say to 20, and hold it there, oh yeah and you need a little POP :wink: (pool owner patience). POP is the hardest - because we all want to keep throwing stuff in the water to "clear it up" The only problem is that everything we throw in the...

If you have a FC of 1 & CC of 3, then you have a TC of 4, Is that correct? That means with the cc chlorine that high, you have may have some organic stuff that ate away the cya. I know that when I open in the spring after having the pool closed, the cya is usually 0. Or you can have a test...

Your ph will go down with the ascorbic acid treatment . I use a pound per 10,000 gals , depending on how much staining there is. Don't worry if the water gets cloudy - sometimes it does after adding the sequestering agent if there is a lot of stain. The pink stuff is good. You follow the...

Thanks for the tip Waterbear :super:

Or it could be staining due to metals - blue plus yellow(stain) will make green :shock:

My panels are plumbed in just like yours. As a matter of fact, I usually don't direct all of the water to the panels. I did have a bad ball joint in last year, and had it replaced. After I backwash and then put the solar heat on, there is no air bubble. Maybe someone around here is turning...

I noticed the same thing with my solar panels :? . When I see the air in the pump basket, I turn the solar off, backwash, turn the pump back to filter, then turn the solar back on - then no more air :?: I don't understand it either. My solar panels are on the roof about 9 ft above the pump...

Once you learn about pool chemistry, having a puck feeder is a good idea. You can manage your cya, and ph by using trichor, and bleach together. I use both. I use my pucks until my cya is in the 30 - 40 range, and then mostly bleach using the feeder when I am away, or have a big swimmer day...