SLAM?

[cloudywater]

Newb here. 20000 gallon inground vinyl liner
Pool slightly cloudy and TC and FC out of balance.
FC is 6
TC is 9
Ph is 7.4
TA is 125
CYA is 65

Have had chlorine tab feeder off for 3 days.

What do I need to do as first step?

 

[MITBeta]

Follow the SLAM Process.

Pool free of debris? Filter and pump working properly? Lower pH to 7.2, add liquid chlorine to bring FC to 28ppm for CYA of 70. Check as frequently as you can and bring FC back to 28.

 

[cloudywater]

Thank you. 2 jugs of 10% should get me close to target but when to stop? Have only basic chlorine and ph tests.

 

[MITBeta]

You need your own quality test kit. See this link: Test Kits Compared.

While you're waiting for your kit, add 5ppm worth of liquid chlorine daily. Don't use any more tabs or granular chlorine.

 

[cloudywater]

You need your own quality test kit. See this link: Test Kits Compared.

While you're waiting for your kit, add 5ppm worth of liquid chlorine daily. Don't use any more tabs or granular chlorine.

How would I measure 5ppm without accurate test kit? Could I just dump 2 jugs in daily for 2-3 days?

 

[MITBeta]

Use PoolMath and enter your pool volume and the concentration of the liquid chlorine you're using.

Fill out your signature with all of your pool equipment.

 

[cloudywater]

Is there an average for days to SLAM given my situation?

 

[MITBeta]

Every SLAM is different. It depends on how much algae you have, how good your filter is, how often you check and top up chlorine, etc.

 

[cloudywater]

Thanks; have to be out of town for a week; have no one to help so I didn’t know which would be better, the multi jug SLAM for a few days or turn the feeder back on, or leave it off and see what happens. Pump runs 9 hours/day.

 

[MITBeta]

Where did your CYA measurement come from?

 

[cloudywater]

Where did your CYA measurement come from?

Had water tested at 3 pool stores; one was 65, one was 67, and one was 70.

 

[Bperry]

Thanks; have to be out of town for a week; have no one to help so I didn’t know which would be better, the multi jug SLAM for a few days or turn the feeder back on, or leave it off and see what happens. Pump runs 9 hours/day.

Turning the feeder back on will make it worse. You can safely add a gallon each day until you leave and then turn the feeder on right before you leave. Then turn it off when you get back.

The pool stores are notoriously bad at testing, especially for CYA. You can get a cheap test kit while you wait or see if Amazon has. Taylor K2006C they can get you quickly.

 

[cloudywater]

Does it make sense to add bleach at night so sun doesn’t affect it? What about the idea of adding 5 gallons of bleach each day for 2-3 days?

 

[an1vrsy]

The TFP pool care is about knowing what your pool water chemistry needs and only adding that. To do that you need one of the recommended test kit, either the TF-100 from tftestkits.net or the Taylor K-2006C from Amazon.

To add 5 ppm chlorine a day before you get your test kit would be to add 1 gallon of 10% liquid chlorine. After you get your kit, post up a full set of results and the experts can help from that point.

 

[Bperry]

Does it make sense to add bleach at night so sun doesn’t affect it? What about the idea of adding 5 gallons of bleach each day for 2-3 days?

A vinyl liner pool can have issues with bleaching the liner at overly high chlorine levels. I’m not sure I’d do that. 1 gallon would be a safer bet assuming your pool size is close to the 20k you have listed.

 

[cloudywater]

As an aside why hasn’t anyone come up with a CYA neutralizer? Thanks for all the replies.

 

[MITBeta]

Does it make sense to add bleach at night so sun doesn’t affect it?

In the end, it doesn't matter much what time of day you add chlorine.

 

[cloudywater]

OK, so came home to a green,cloudy pool.Ph at 7.5,TA at 110, FC at 7.5, CYA at 60.What does it mean on the pool calculator when it says the SLAM level is outside of recommended range? For example it says to add 4+ gallons of bleach for a SLAM level of 28. Does the warning apply to normal target level of 10 not the slam level?

 

[MITBeta]

Yes

 

[cloudywater]

Today: got rid of the green but pool is still so cloudy,can't see drain. Gonna run pump overnight and check in morning. Backwash is clear water.