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Comments for
Question About Swimming Pool Sand Filter

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Sep 19, 2011
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Walter, 190L jacuzzi
by: Anonymous

Hi, I took mine apart, no problem, the same as detaching from the tank. I have sand in the pool too, but my valve seems ruined. I got it used and tried 3 different gaskets and it leaks in 5 places. I'll give you my old valve if you pay shipping... charleshenryjunior@hotmail.com (but just jr, not junior)

Jul 07, 2011
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Comment By Robert
by: Anonymous

Thanks for the readings Liz

I'm hesitant to tell you to shock with Dichlor chlorine. This is a stabilized form of chlorine that will add CYA into the pool.

You'll need to get the CYA level up, then keep the chlorine level above 12ppm to kill the algae.

If you have an elevated CYA level it will only make matters worse.

On the other hand, I don't want you to keep throwing chlorine in the pool without having any CYA in there.

The best thing to do right now is to shock the pool with regular chlorine at night, then retest in the morning and see what the chlorine level is.

Like I said, the chlorine needs to stay above 12ppm and you need to back wash once per day until the algae is killed.

You'll know this because the water will turn to a white/gray color.

Keep the chlorine level elevated all through this process.

You can also use a PolyqQat 60 algaecide to give you a little more added insurance against another alge bloom while this is going on.

Here are some posts to look over:

Why Is The Chlorine Gone Overnight

Green Pool Water. It's Blue But Still Coudy

Pool Still Green After Many Attempts To Clear!

You'll need to manually dose your pool to keep the level above 12ppm. You might go through alot of chlorine but it's the only way to get rid of the algae.

Here are links to the chlorine pages. They have charts you need for your size pool.

Go just a little over the recommended dose for chlorine. It's better to go a little over than not hit the mark. 12 - 15ppm chlorine is fine for a good shock.

Swimming Pool Chlorine

Pool Shock

Pool Chlorine

There's also more posts on the Q&A in the "Algae/Green Pool Water" category.

Hope this helps and let me know how it turns out for you.

Robert

Jul 07, 2011
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Has My Filter Gone Bad
by: liz

Help!!!! my pool is green.

We had the water tested at 2 different pool stores, they both say the water is fine.

We changed the sand in our filter and the pool is still green.

Is it time for a new filter or could there be a problem that we are missing.

I appreciate any feedback.

Thank you.




Answer

By: Robert
Date: July 7, 2011

Thanks for the question Liz

First, I'd like to have your complete chemicals readings:

Chlorine

CYA (cyanuric acid/stabilizer)

pH

Alkalinity

Calcium Hardness

Metals (iron and copper)

Total Dissolved Solids

It makes troubleshooting much easier and the process of clearing up your pool will go much faster.

Without these numbers I'm just guessing at what the problem is. What were the exact readings that the pool store had?

There could be several reasons why your pool is green.

A lack of chlorine is the most common. All of the readings are important, but I would especially need the CYA level.

That acutally could be too high which would render the chlorine less effective.

Is the pool a solid algae green or an emerald clear green? You would approach these from different angles.

Also, did you put enough sand in the filter?

If you do put new sand in be sure to put the correct number of pounds in and get the correct size sand for your filter.

The "freeboard" is the measurement from the top of the tank to the sand.

You can call the sand filter manufacturer and get the correct measurements.

As the sand is used it will start to settle a bit. This is due to the water weight and debris that gets trapped in the sand.

You'll need to back wash, then measure the freeboard once again and top off the sand if necessary.

It may take only an inch or two.

Get back to me with your readings as soon as you can so we can get your pool up and running once again.

Robert





Comment

By: Liz
Date: July 7, 2011

Thank you Robert for your quick response.

We threw out the exact number from Island Rec. but I tested the water with a testing strip and these are the numbers I came up with me.

Hardness 100

total chlorine 5 to 10

free chlorine 10

pH 7.2

total alkalinity is 40.

Hopefully you can help us. Thanks again!





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