Smelly water

[PammyB]

Pool all of a sudden has fishy smell - nothing dead in skimmer - chlorine level normal for end of day 1.5 FC - water is clear , should I just shock ?

 

[reggiehammond]

1.5 FC is quite low - wouldn’t be a stretch to imagine you’re smelling the presence of organics in your water. Is your Taylor test kit still in the mail?

 

[PammyB]

1.5 at the end of the day is low?
No that was tested with a Taylor kit

 

[Mdragger88]

1.5 at the end of the day is low?
No that was tested with a Taylor kit

Most likely- what is your cya?
FC/CYA Levels

 

[PammyB]

CYA is 35ish
I add chlorine nightly to keep my chlorine around 3-4 usually it’s going down by around 2ppm per day . What should I be putting it to?

 

[reggiehammond]

CYA of 40 (always round up) has a range of 5-7, minimum of 3.
The above linked FC/CYA Levels has the chart.

You never want to see the minimum, always stay above it.

 

[PammyB]

Should I just put it up to 7ppm or SLAM?

 

[Mdragger88]

You’re inviting algae & other unsanitary things to grow by letting it get that low.
Always stay above minimum for your cya.
There are also no inbetweens for the cya test so if between two values round up.
Your cya is 40 - dose to high target & replenish before you reach minimum.

Since this has been a regular occurrence you should do an
Overnight Chlorine Loss Test at target fc levels to be sure nothing is brewing.
If you fail —>
SLAM Process
If you pass - maintain as outlined above

 

[reggiehammond]

Should I just put it up to 7ppm or SLAM?

A good test to see if you have organic growth is Overnight Chlorine Loss Test. You’ll want FC up to 7ppm or more to give enough FC to get a good reading.

If you pass the OCLT, then you don’t need to SLAM. But if OCLT is a fail, then yep, time for SLAM Process.

 

[PammyB]

I figured since my daily FC loss was the same as always ( about 2ppm from night before ) that the problem wasn’t organic growth but I’ll do it to be sure!