Green pool

[PoolDoc]

You're welcome.

[lande]

Things are looking up. The pool is no longer emerald green but much a much lighter shade. It is still cloudy. This AM the values were: CYA 50, FC 8.5, CC1.0, TA 130 and Ph 7.5. I have had to add some more water to the pool because of the backwashing.

Shall I still put in the 4 gal. of chlorine this evening? I have some Super Shock (Kem Tek) Trichloro - s- triazinetrione that I had before I joined BBB. Can I use any of that?

When using the pool calculator, how can I tweek it to tell me shock levels of chlorine and not just maintenance levels?

Thank you for your help.

[PoolDoc]

If it's still green, add the 4 gallons. Chlorine won't clear water made cloudy by dead algae -- you have to filter OR settle & vacuum for that. But chlorine will kill algae, turning green to gray or brown.

[lande]

THINGS ARE IMPROVING!! We can see the bottom at the shallow end and we can see the light in the deep end. The water in the deep end is still green but a much lighter shade. We have been testing 2X day, using the pool calculator and brushing frequently. I do have a concern. There is a green line all the way around the pool at the level of the top of the light. The swamp water was at that level for at least a week while we waited to see if the repair to the leak at the light actually did the job. My concern now is that the fiberglass is rough from that line down into the pool. The hose of the polaris and the polaris itself is coated with a rough grey green substance. Have we ruined the fiberglass finish?? Is this scale?

This mornings readings: FC 10.5, CC 1.0, Ph 7.5, TA 140 CYA 40

[PoolDoc]

It sounds like you have something that I've called "sand algae" -- under certain conditions, algae can build tiny calcium domes over itself. When the algae is dead, the scale remains. You can check it this way:

1. Remove the Polaris from the pool.
2. Fill a 3 - 5 gallon bucket with 1/2 gallon of bleach + 1 gallon water.
3. Put a section of hose in the bucket, so the green scale is immersed in the bleach solution. You don't need to remove the hose to do this; just fold a section into a 'U' and put it in. Set something on the hose, to hold it in place for an hour.
4. Remove the hose, and pour the bleach into the pool. Rinse the hose with fresh water and then inspect: if it's sand algae, the scale will remain, but will be tan to brown, instead of green.
5. If it appears to be sand algae, continue to step 6. Otherwise, report what you found here.
6. Rinse the bucket out, and fill it with 1.5 gallons of water. Add 1/2 gallon of muriatic acid. Put the bleached section of the hose in the acid solution; wait 5 minutes. Remove and rinse. The scale should be gone. Pour acid solution into pool.

CAUTIONS:

1. The bleach solution will damage clothes instantly, and eyes quickly: wear old clothes and safety glasses, or at least, sunglasses. Have a hose ALREADY RUNNING a small stream of fresh water, nearby. Rinse spills promptly.

2. Muriatic acid fumes and damages eyes, and can burn skin. You need glasses and gloves (kitchen gloves are fine). Once it's diluted, it will stop fuming. READ THE MURIATIC ACID PAGE, linked in my signature.

NOTE:

1. You need to report pH, alkalinity AND . . . calcium levels. If this is sand algae, you'll need to manage those levels differently.

[lande]

Sorry for the delay in responding but our Polaris was not working. I think we are back on track now.

I looked at the pictures posted on the "sand algae" topic and the picture of the "eye" looks like what we have. While working on the Polaris, I rubbed it with vinegar and it did do the trick - with a little elbow grease. It is the color of dull mustard and feels like sandpaper.

It has been a week since signing on with the BBB method and I realize how much there is to learn. The pool is greatly improved. It is light green in color and cloudy. The ring I spoke of still exists but it appears to be lighter in the shallow end.

FC 10, CC .5, Ph 7.5, TA 150, CH 140, CYA 30 What next?

Thank you for your input.

[PoolDoc]

Read this page: http://www.poolsolutions.com/gd/lowe...p-by-step.html

and, then lower your alkalinity to around 60 - 80 ppm, while holding the pH 7.0 - 7.2.

Continue to keep the chlorine at 5+ till all the green is gone. Brush the pool every few days. It may take 2 weeks or more to dissolve the calcium capsules, but you don't want to go faster, since really low pH can damage the fiberglass.

[PoolDoc]

Here's the sand algae page:

http://www.poolforum.com/pf2/showthr...111-Sand-Algae