Pool can't hold chlorine

Jump to latest Follow Reply
S

spartan_n

Active member
Aug 17, 2015
31
ca
Hello everyone,

Here is my latest test from Leslie
ph:7
cya 25
fac 0
tac 0
po 200
tds 3200
alk 90
mt 0

Little bit of history: i have a 18000 plaster pool with pool cover in Socal. have apool guy come in every week who uses liquid chlorine. I am the only swimmer in the pool and never had an issue last 5 years. A month back, he skipped two weeks and asked me to add 1 gallon of liquid chlorine which i was not able to do so i used one of those clorox tablet in a floater. Since that time, the pool got a bit cloudy. Last two weeks he has added almost 2 -2.5 gallons of liquid chlorine per week along with stabliser powder but by the next day the FC is back to 0--based om leslie test. he also thinks the pool is not cloudy though when swimming, i definately find it cloudy (i cant see the end of the pool which i could before underwater). i think he is very busy and does not care as much as i do, so i am thinking of taking care of it myself. Leslie advice was to use flaoter with two 3in tablets per week along with 2 lbs of soda ash to get the PH to the righ levels. I bough this stuff..but wanted to check if that shld be the approach or somethign else. BTW, the pool is gettign very hot last month running 88-90C and not sure if that is causing the FC to go down so fast. the pool does have a UV cover. thanks in advance
 
The lack of chlorine in the 2-week period has resulted in the start of an algae bloom. You need to follow the SLAM Process to get rid of once and for all. That process works, but you also need to test the water yourself 2-3 times per day with a TF-100 test kit. During the SLAM Process, leave the cover off and use only regular bleach/liquid chlorine to increase and maintain the elevated FC (SLAM) level as noted on the FC/CYA Levels based on your CYA.

Let us know if you have any questions. Have a great weekend.
 
thanks for the reply. couple of more Questions.
1. I have added the soda ash to raise the PH before starting the SLAM process. this however has made the pool very cloudy, Do i need to wait for it to clear before starting the SLAM
2. can the algae bloom be invisible?
3. do i need to raise the CYA from 25 to 30+ before starting the SLAM?
 
hello All,

so couple of updates and advice needed.
Started the SLAM on tuesday and using taylor 2006 kit for testing. The pool water is clear. CYA is in the 30-35 range. FC is still reducing rapidly. yesterday night added chlorine to get FC to 14 (arounf sunset) . today morning (9.30am) FC is 7.5
Water temp is arnd 85C. the pool has an automatic cover. the reduction in FC is puzzlign given the pool is super clear.

is the low CYA causing the FC to go down so rapidly? should i add some stablizer to increase the CYA or continue with the SLAM at the current CYA levels.

thanks in advance :)
 
spartan_n said:
Ok. Also my TDS is 3200. Could that be causing it?
Click to expand...
TDS is a meaningless value.
CH, CYA, Borates (if you added them), and salt are the constituents of TDS that matter.

Your K2006 can test CH and CYA. Post a full set of test results from your K2006 kit.
 
Reading your thread I see every sign pointing to algae. Seeing you lost 6pm chlorine overnight is the clincher that algae is ready to take off. You simply haven’t finished the SLAM Process.

 

Enjoying this content?

Support TFP with a donation.

Give Support
full
 
I see you gave a result for CC as .2, but your FC is 10.5. Not sure if you're using the 25ml sample, but if you are you can use the 10ml sample. Each drop is .5ppm which is plenty precise for your purposes. It will save reagents.
 
lost another 6ppm last night. continuing the SLAM with 10ml samples :) since my regent is almost over--ordered more.
here are some pictures and wondering if this is some form of algae or just plaster discoloration? does not come off with brush..


IMG_20190913_095433.jpg
 
It appears to be calcium scale with some algae embedded in it. Normally the cause is a high pH for a LONG period of time and then chlorine too low and that allows algae to grow and embed in the scale.

Fix? Not easy to remove the scale but that is the first job. Drain and acid wash, no drain acid wash or just dropping your pH down to around 7.0 for a LONG time are three approaches.

Once that's done, it is pretty easy to SLAM the pool and then maintain your chlorine higher so the algae doesn't reappear.
 
Have you used any products with copper in it? Like algaecide, pucks with blue in the name, etc? Do you have a pool heater?
 

Enjoying this content?

Support TFP with a donation.

Give Support
You must log in or register to reply here.
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.
Top Bottom
Back
Jump to latest Follow Reply