Greenish Blue Pool Help Needed

[Jdevi123]

Hi - I recently bought a pool that was in bad shape. I have removed solids, vacuumed and scrubbed algae. There is still a small amount of algae that I can see in the pool. I treated with algaecide, stabilizer and shock in the beginning. The only thing I have add now regularly is chlorine tablets. Tests below with the K-2006. I scrubbed yesterday and need to vacuum again. What should I add next?

FC=1
CC=8
pH=7.8
TA=150
CH=140
CYA= Less than 30. The sample never turns cloudy, and I can still see the black dot.

 

[PoolStored]

Hey!!! Welcome to TFP!!

I would add enough Chlorine Stabilizer (CYA) to add 30ppm of CYA to your pool. Put it in a sock in the skimmer or hang in front of a return. Do you have PoolMath? If not, download it, it will help you with what and how much to add. -->PoolMath

To rid your pool of ALGAE, follow this process:

SLAM - Shock Level and Maintain

We’ve all had to deal with a green pool. Clear algae from your pool with a SLAM! Read here to use shock level and maintain to clear your pool.

www.troublefreepool.com

Ask any questions you have, we have a HOARD of people here willing to help!!!

 

[PoolStored]

Two things of note.
1) With a CC of 8, you likely will use a large amount of liquid chlorine at the beginning of your SLAM. Just be prepared.
2) Pull that ladder and clean the inside of the tubes. (ask me how I know). LOL

 

[mknauss]

Welcome to the forum --
By large amount of chlorine, PS is implying your water may have ammonia in it, or the algaecide you added was ammonia based. The high CC is from ammonia. So if that reading is correct, you will need a large amount of chlorine to consume that ammonia. Do NOT add any stabilizer until your FC holds.
Read Ammonia - Further Reading

 

[PoolStored]

Great catch @mknauss.

Follow the link to the Ammonia process first. When your FC holds, then follow the process I laid out (CYA and SLAM).

 

[Jdevi123]

Thanks for the information. I had bought the Assault 73 Shock and Durachlor Stabilizer from the pool store. Where is the best place to buy all of these chemicals? I have a walmart close by and a hardware store that carries outdoor bleach.

Should I order the CYA or shock online?

I scrubbed the ladders, but they are hard to get every crevice. Good idea on pulling them.

 

[PoolStored]

Thanks for the information. I had bought the Assault 73 Shock and Durachlor Stabilizer from the pool store. Where is the best place to buy all of these chemicals? I have a walmart close by and a hardware store that carries outdoor bleach.

Should I order the CYA or shock online?

I scrubbed the ladders, but they are hard to get every crevice. Good idea on pulling them.

The Durachlor stabilizer is just fine...that is CYA. To address the Ammonia and Algae (SLAM) use Liquid Chlorine. Bleach is fine too. NO FRAGRANCES, NO GREEN, NO BLUE, NO SPLASHLESS, NO CLOROX, JUST BLEACH.

Assault 73 is Caly Hypo. It contains calcium. I'd reserve that for use at a later date. In addition to chlorine, it adds calcium, which is not necessary in a vinyl pool.

Take the plugs out of the ladders and scrub inside the tubes.

Good to go!

 

[Jdevi123]

Thank you for the help. I'll update after the Ammonia is removed and the SLAM process is complete.

 

[Jdevi123]

Alright, I started the shock yesterday evening. I added gallons of liquid chlorine in increments of 6, then 3 sets of 2, and finally 3 this morning before work. The last readings before the 3 gallons were added this morning were FC=7 and CC=2

Looks like I'll be buying more liquid chlorine today. I'll get back on it after work.

 

[Jdevi123]

I added a total of 27 gallons of liquid chlorine from walmart the last 2 days. As of this morning, the pool was blue, the FC=15 and CC=1.5. Last night, the FC=29.5 and CC=2.

Again, looks like I'll be buying more liquid chlorine today and I'll get back on it after work.

The method is working!!

 

[PoolStored]

The method is working!!

Yep! I have a 30K pool and used 45 total. Haven't had to slam since. Once and done, if you watch your chemical levels.

 

[Jdevi123]

It rained last night so my chlorine loss test showed a big loss over night. FC=14 to FC=10

CC=0.5

Pool is very clear. Not sure what to do about the brown stains

 

[MichaelT20]

(Noobie here so just repeating what I’ve read)

Make sure to validate the OCLT tonight - losing 4ppm overnight, even though your water is clear, suggests you might not quite be done yet. Hidden algae can come back with a vengeance.

Make sure all 3 criteria pass before ending your slam .