I see the light with a real test kit. Now the Questions

[jgonyer]

Just got my Tft-100(Was averaging the results of 2 cheap kits before) I love being able to see exactly how the pool is doing.
Results
pH 7.5
FC 4
CC 0
TA 120
CYA 75
CH 50
First question do i need to raise ch being a vinyl pool?
2nd I added acid to drop TA. do i need to wait for the ph to drop to 7 before i aerate?

 

[dkimble]

Pool volume? How much did you add? And type of pool doesn't matter with chlorine levels.

 

[jgonyer]

pool volume is around 26,000 gal. pool math called for 81 oz I added a half gallon(didn't want to over shoot the ph drop)

 

[dkimble]

I have learned to look in this order...

FC
CYA
PH

Get those right first. Sometimes the type of pool matters... What is yours?

Get this right first...

 

[dkimble]

Oh, plug the cya number into pool math with your volume... FC seems low for that CYA...

 

[dkimble]

I saw vinyl pool... So FC, CC, CYA and PH are your focus...

 

[Jabird]

FC is definitely low for your CYA. Also, there are no half numbers for CYA. Always round up, so I would call your CYA 80.

- - - Updated - - -

Your minimum FC is 6 with a daily target of 9-11

 

[Richard320]

To answer the questions...

Low CH is no problem for a vinyl pool. Save your money unless the water gets foamy and it bugs you, in which case a little CH addition will stop it.

The TA is down now since you added acid. Aeration just drives the pH up faster so you can repeat the process sooner. I wouldn't bother. It'll pop up fast enough on its own.

 

[George D]

According to the chart, With a CYA of 80, your target FC should be 6 in a SWCG pool. 9-11 is for non salt pools.
SWCG Pools

CYA (Stabilizer)	Minimum FC	Target FC	Shock FC
60*​	3​	4​	24​
70​	3​	5​	28​
80​	4​	6​	31​

 

[jgonyer]

Thanks. I noticed fc was low. I'm bring that up also.