Can't get Chlorine to hold

IceShadow

Gold Supporter
Jun 8, 2019
1,072
Milwaukee, WI
The saltwater is irrelevant until the SWG cell is active.

That said - you're not at standard levels, you're at SLAM levels. Burnoff will be higher at that higher level of FC than the standard 2-4ppm I mentioned earlier. (Brain fart, forgot that until now. Still new to all of this myself!) Hard to say if it's standard or not, but if you don't see any more of that dead algae tomorrow and you have no CCs, water still clear and no loss overnight, then you should be good to end the SLAM.
 

ScubaDoo

Well-known member
Jul 3, 2019
84
Great Lakes
Updates:

630 FC 11.5 (add 1/2 L chlorine)
815 FC 12.5, CC 0.0 (no add!! 😜🎉🎊🎉🎊🎉)

Note: sun is off pool around 630

Questions:

The stains are getting bad... Can I add anything at this point? Would "Stain & Scale" be OK? I'd hate for them not to come out after. Starting to see new tiny rust stains and what looks like sea salt in the skimmer sock.
 
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ScubaDoo

Well-known member
Jul 3, 2019
84
Great Lakes
Good morning, updates:

Tested at sundown last night:
845: FC 12.0

Then midnight: FC: 11

Then 6am: FC 11, CC 0.0

Now at 9am: FC 10

Water is very clear, and saw just a tiny amount of grey dirt/algae on pool stairs. After touching it, some of it was gritty like sand (was sand) and other was very like dust that washed away.

What do you guys think? Good to let it drop now?
 
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wireform

Silver Supporter
In The Industry
Aug 15, 2017
486
Spring Valley, NY
You can either call it done or since it's holding the fc very well go one more night olct. Either way your good. Vacuum that stuff and get it out of the pool/water. I would recommend backwash afterwards too then definitely DONE.
 
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ScubaDoo

Well-known member
Jul 3, 2019
84
Great Lakes
You can either call it done or since it's holding the fc very well go one more night olct. Either way your good. Vacuum that stuff and get it out of the pool/water. I would recommend backwash afterwards too then definitely DONE.
Should I try to keep it at 12 FC if I want to do one more OLCT? Or let it drop to like 6 FC as my low CYA (30) makes it tough to hold on a sunny day like today.
 

wireform

Silver Supporter
In The Industry
Aug 15, 2017
486
Spring Valley, NY
You an go with one more night. That's what I would do if it would be my pool. I would let the experts chime in if it would make sense to raise your Cya some as the sun exposure is alot.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
10,749
Northern NJ
You are in Canada? Canada does not have the sun angle Texas does. Keep your CYA at 30 until you are sure you are done with algae.
 

wireform

Silver Supporter
In The Industry
Aug 15, 2017
486
Spring Valley, NY
You are in Canada? Canada does not have the sun angle Texas does. Keep your CYA at 30 until you are sure you are done with algae.
That's what I wasn't sure about but I can't agree more not raise it till all algae is gone because cya can make your life more difficult at times. Good luck.
 

ScubaDoo

Well-known member
Jul 3, 2019
84
Great Lakes
You are in Canada? Canada does not have the sun angle Texas does. Keep your CYA at 30 until you are sure you are done with algae.
After drop of 1 FC overnight, no CC and clear water (see above for results), does it sound like the algae is finished off? Should I let the FC drop to normal ranges (FC 6)? And then run a OLCT tonight at FC 6?
 
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justinc

Gold Supporter
Apr 3, 2019
591
Texas
To clarify what above poster said, "super high" chlorine readings that render pH testing inaccurate are anything over 10ppm (which really isn't that high in my opinion). But just want to clarify what he meant by "super high".
 

Silver_2000

Gold Supporter
LifeTime Supporter
Nov 29, 2015
503
Carrollton tx
Was referring to earlier "
I tried more (5L bottle) to try to kick start it. Did a test 5 hr later and chlorine was very high (off chart of tester 10+) and PH (8.2) was now as well. Before bed last night put in some dry acid to bring down PH and planned to let sun burn off some chlorine in the sun the next day. Woke up, tested and FC was back to 0.0 and PH was 7.2."