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Could be, but I did try some Sea Clear clarifier before that, so who knows? Water can sometimes be a mystery to me :wink:

I was having the same problem at the beginning of this summer. My free chlorine was losing about 1ppm overnight, but since I live in the woods I considered it ok. I kept my chlorine level at the high side of shock levels for my cya. I don't normally use algaecide, so I just kept the...

No, you will have to take it up to shock levels, and hope that the stains do not start to reappear. I would bring my ph down to 7.0, slowly bring the chlorine up to shock with bleach - and look for stain starting to reappear. If you see stain, add more sequestering agent, but keep taking the...

You can add some polyquat algaecide too if you haven't already. Some clouding is usual though, so don't worry too much.

When you do the ascorbic acid treatment it sometimes takes a while to hold chlorine levels. This is the chlorine eating up the remaining ascorbic acid. You need to make sure there is enough sequestering agent in the water to bind with the metals that were lifted off the surface of the pool and...

You can get them anywhere. Look for the cheapest place - hopefully with free shipping, and make sure that the metal out is not the cheap kind. You want one that is at least $15.00.

How does it look today? What are you testing with? Is your pump fixed?

Could there have been some algae on the solar cover? Sometimes if the chlorine is just a tad low, and some algae is introduced, then the algae starts to eat the chlorine, and bingo an algae break that you never saw coming :evil: Just a thought on what might have happened :)

Have you used any copper products in the pool?

Yes, make sure you shock back up to 25. The ore consistant you are with keep the chlorine high, the faster the algae will all be killed. 8) Just a note - I have gone swimming in my pool at levels of 25ppms, and my cya at 40. I didn't even get any fading of swimming suits :wink: . The only...

Yes, I would turn off the swg, and shock it back up to 25. If you lost that much chlorine in one day, you are still battling the algae :wink: Test in the morning, and if you use up more than 2ppms of chlorine, you will have to take the chlorine up to 25 again. The more you take the pool...

And shocking goes hand in hand with your cya level - if you mean you use one bag of shock per week, then you are only taking it up about 6ppms per 10,000 gallons of water. :shock: So one of the ost important numbers to know is your cya. You also hae to watch your calcium levels if you use the...

If your free chlorine dropped 6 ppms overnight, then you need to keep the chlorine at 25ppms till it holds. If you let it drop now, you will probably see the algae come back - especially mustard algae. You didn't post your cya, check out Chem geek's best guess table, and it gives you numbers...

You can just buy the dpd powder itself. You also can test high chlorine levels with the "shot glass method" using a shot glass and distilled water, here is the method Here's the Jen-You-Whine CarlD Shot Glass Method!;) 1) Get a shot glass (like you use to mix drinks). 2) Get a gallon of...

First I would like you to post your numbers as of today - if you can get to a pool store to test the water that would be best *if you don't have a TFP pool kit :) . It seems to me that you have two problems going on now - you have algae, and taking it up to shock just once a day is not going to...

Are you sure it's algae? Try rubbing it wil a chlorine puck - if it comes off it is organic, if it doesn't try rubbing some crushed vitamin C tablest in a sock on it, if it lifts or gets lighter it is a mineral (metals) stain.

I second JasonLion. Now is perfect because you wouldn't want to swim anyway :)

You can take the alkalinity up to 90 - 100, and add some more sequestering agent - this should bring your ph down. You can take the ph down to 7.0 -7.2 and keep the water circulating. The low ph should help lift the stains with the sequestering agent. The higher alkalinity should help with...

I would just continue as you are - raise the alkalinity, keep the ph low, and blast it with bleach. You don't have to worry about the cya - 30 is ok. Don't put any ascorbic acid in right now, as it will use up the chlorine, and that isn't what you want to do right now. You can do it later...

So sorry to hear of all the problems, I really can relate :oops: What I would suggest is to take the alkalinity up to 80 with baking soda, and the ph down to 7, and continue with the bleach until all of the algae is gone. Once the algae is gone, you can keep the ph low, and add more...

By slowly raising the chlorine, I mean using bleach and take it up to the low end of your "best guess chart". I like to use bleach, because you can use as little or as much as you want more easily then the pucks, or even bags of shock. You know that 1 gallon of 6% bleach will raise your...

Hi Chemgeek, I do have adding polyquat 60 in the ascorbic acid sticky. It is a good idea. The only thing the poly 60 will do is eat chlorine, which with the ascorbic acid treatment the chlorine is at 0 anyway :) I do think that I am going to change the sticky to read start to raise the...

JasonLIon is right - Lower the ph - adding sequestering agent will lower the ph too. After the ascorbic acid you should start to add bleach, you should take it right up to the level you need for your cya, which in your case would be 5 to 10 ppms. You do this slowly, and watch to see if you are...

You can try crushing up a couple of vitamin C tablets, put them in a thin sock and rub it on the stain. If the stain lifts, then it is a mineral stain. Let us know if it works.

Your numbers are perfect :) , I don't think it is algae - especially if it didn't spread. Enjoy the pool 8)

Here, here, Mermaid Queen :) That is the best advice :cheers: :cheers:

The main thing I see in all of your posts is the fact that your cya is way high :cry: That is why you have a consistent algae problem. With the cya you have you should always have a minimum of 8ppms of chlorine, and to kill the algae you will need to shock to 25 and leave it there. As you can...

I could be pink algae - you should post a full set of numbers, and what you are using to sanitize the water.

I'd believe you in a heartbeat :wink: , You really know your stuff :bowdown:

You may have some dirt encapsulated scale. You will have to post a full set of numbers so we can better help you. Especially calcium, alkalinity and ph.