Need some help CYA high and New to testing

[onedah]

Test 12

I think I'm getting somewhere. The cleaning seems to have helped.

My FC is 22.5

It has not changed in the past 1 hour.

 

[onedah]

Test 13

FC went down to 20

Could it be the sun? I thought I was getting somewhere but in the past hour lost 2.5ppm in FC from 22.5 to 20

 

[linen]

Yes, sun will deplete your chlorine. That is why we use the OCLT to judge if everything is dead...no sun.

 

[onedah]

So can I start the OCLT soon as the Sun is off the pool or do I need to wait until the sun goes down and its dark?

Sorry for the endless questions....


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[linen]

Sun needs to be totally off the pool.

 

[duraleigh]

So can I start the OCLT soon as the Sun is off the pool

Have you met the other two criteria?

1. Your pool water is sparkling
2. Your CC's are .5ppm or less

There's no point in an OCLT unless you meet the above.

 

[onedah]

So can I start the OCLT soon as the Sun is off the pool

Have you met the other two criteria?

1. Your pool water is sparkling
2. Your CC's are .5ppm or less

There's no point in an OCLT unless you meet the above.

The pool met both the criteria and I decided to do the the OCLT and it failed

Reading last night was FC 23.5, This morning FC 20.5

Pressure on the pool looks good, water is sparkling clean - have been at this a few days now. I had a small break out of Algae and my CYA was very high. Have since drained and refilled and YA is @ 50.

I have not opened the filter and cleaned it out - would that be something I need to do?

 

[onedah]

#rd night for OCLT and it failed again.

1. Pool water is sparkling
2. CC's are .5ppm or less

Lost about 2ppm of FC.

Is this normal? I started with water being clear with high CYA and little Algae on the walls.

 

[Smykowski]

Is this normal? I started with water being clear with high CYA and little Algae on the walls.

Yes. It is possible for the water to be clear but still have algae, it just hasn't blossomed to the point of being visible. In your case, there was/is something there, and you're in the last stages of clearing it out.

 

[danacc]

I have not opened the filter and cleaned it out - would that be something I need to do?

No. You should backwash if the pressure goes up, but slamming doesn't require you to open the filter and clean it out.

 

[spidey07]

#rd night for OCLT and it failed again.

1. Pool water is sparkling
2. CC's are .5ppm or less

Lost about 2ppm of FC.

Is this normal? I started with water being clear with high CYA and little Algae on the walls.

Yes it is normal. Your testing and constantly maintaining shock levels are working. Keep at it. Keep SLAMing. It will work. You're in the home stretch. Do not let up.

 

[onedah]

I have some great news - my pool finally passed the OCLT. I lost 1ppm overnight so I am done with SLAMing. :-D

It was defiantly a journey and took patients and persistence, and have learnt a little more about my pool.

Some learning’s I'd like to share:
1. Expect the SLAMing process to take longer than a few days - especially if you have Algae (When I started I thought I would be done in aday or too)
2. Have plenty of bleach and reagents for FC testing
3. Make sure you get behind light fittings, ladders, skimmer flaps etc and clean clean clean to get the algae into the water so the Chlorine can do its work

Thanks for the support of the forum.

 

[duraleigh]

Nice work You have obtained a good grasp of pool water chemistry and now you know what to do to keep your pool crystal clear the rest of the season. :lol: