Home from vacation and pool is green!

[Monkey's Mom]

We were in Mexico for a week and returned to a light but obvious green pool. Somehow our SWG was set at 13% plus we had a lot of rain...

PH 7.5
FC 0.5
CC 0.5
CYA 35

Gallons 18,850
Temp 85

I think we need to shock the pool and get our FC up to 14 per the pool calculator and monitor it until the FC doesn't drop, the pool clears and our CC remains less than 0.5, hubby doesn't think we need to shock it.

Help!!!

 

[pwrstrk]

Yep. You need to SLAM. Follow the directions in pool school to the T. Turn off SWG and use bleach.


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[pwrstrk]

Also your CYA is low for a SWG. you want your CYA to be 70-80 ppm for SWG. But leave it where it is for now.


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[Monkey's Mom]

Thank you! This is our first time having a green pool...

I turned my SWG to 0%. I just added bleach 8.25% to raise my FC to 14 per the Pool Calculator based on my CYA level. Should I re-check the FC in an hour and then add more bleach to keep it above 14 until it passes the over-night test and looks clear? How long should I wait to add CYA? I am actually thankful the CYA was low from the heavy rain as my shock FC is lower than if it was in normal range.

 

[Smykowski]

Wait an hour or so then retest and redose. The loss between the first two tests will help you decide how long to wait until the third. Everything else you said is correct.

Wait until the SLAM process is over, then bring the CYA up.

 

[Monkey's Mom]

Thank you so much for the help! Can anyone explain why my CC is only 0.5?

 

[duraleigh]

Can anyone explain why my CC is only 0.5?

Not sure I understand....what do you think it should be?

 

[pwrstrk]

I think she wonders why because pool is light green.

Just my guess.


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[jblizzle]

Ideally the CC should be 0. Note that presence of algae does not necessarily mean you will read high CC values.

 

[Monkey's Mom]

I went to bed last night after 3 doses and the FC was 16, woke up at 5 am (5 hours later) and it was 8. I added more bleach and have been testing it hourly and adding more bleach to keep my FC above 14. Pool is still a green tint. We've gone through 6 bottles of 8.25% bleach. Wonder how many more I will use?

I expected my CC to be higher due to the algae.

 

[duraleigh]

We've gone through 6 bottles of 8.25% bleach. Wonder how many more I will use?

It depends on how much organic material is in your pool. On the high side, people have reported 80 jugs, I think.

6 gallons is VERY low and I think you will use a LOT more since you still have some green in your pool.

You can disregard your CC's test while you are SLAMming. Test again when your pool is spakling.

Keep your chlorine up....there is no alternative.

 

[Monkey's Mom]

We've gone through 6 bottles of 8.25% bleach. Wonder how many more I will use?

It depends on how much organic material is in your pool. On the high side, people have reported 80 jugs, I think.

6 gallons is VERY low and I think you will use a LOT more since you still have some green in your pool.

 

[duraleigh]

Yeah, sorry. It takes what it takes.

 

[Monkey's Mom]

Ok, so this time I waited 2 hours to check the FC and it was 11.

I've been reading pool school and since we checked the CYA last night indoors (35) and it is recommended to test during the day outdoors, I re-checked it outside in the sun as directed and it reads 20. I don't know how it is that low but anyways, should I lower my shock FC to 10 as the chart says or keep it at 14?

My test kit is ~18 months old but has been stored in a closet and I have plenty of it. Would this make a difference? It's only day two and I'm feeling defeated...

 

[Monkey's Mom]

So I decided to take a water sample down to the pool store to double check my CYA. He registered it at 30 in the store light. He then said your chlorine is WAY too high. I explained the SLAM process and he said the bleach would eventually "bleach out all my numbers" and I would be in a mess, so I needed to stop that now and that he had a product that would get rid of the algae in 1 day but that I would always have issues with algae. I declined and said I would trust the process and told him I haven't had algae in almost 2 years that I have had my pool using the tips from TFP. He was dumbfounded I haven't had algae

 

[pwrstrk]

If you think your CYA is truly 35 use what the chart says. I would recheck it the next time you have a good sunny day.

I think the kit is good for 18 months. Might be ok if stores properly.


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[Monkey's Mom]

Thank you pwrstrk. I have a question regarding "heaping" spoon full. I went about 3 1/2 hours between testing and the FC was 7. That seemed low so I tried again and got 8.5, I used 8 for the pool calculator and kept my target at 14 so added 172 oz of bleach. We are now up to nine 122 ml bottles of 8.25% bleach. The water looks much better than yesterday, almost normal. We keep finding areas of green on the pebble sheen and keep brushing the pool. I keep reading stories on the process but worry about the amount of bleach I have poured into my pool and the accuracy of my "heaping" spoon full to test the chlorine.

Must.trust.the.process.

 

[pwrstrk]

Too much powder is not a prob. Too little is. You might want to check FC levels a little more often. The longer you keep it at a higher shock level the faster the process will go. You know the three tests you have to pass to stop the slam.

POP pool owner patience !!


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[Monkey's Mom]

Pool is looking SO much better but we are still losing FC so we are continuing with the SLAM process! Currently on our 12th jug of 8.25% bleach.

 

[pwrstrk]

Remember its a process. Keep the throttle down and it will surrender.




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