Phosphate Levels

JpoC

Member
Oct 6, 2017
9
Lake Forest / CA
#1
Hi All,

Just got a comprehensive water test done at Leslie's. Their test matches up perfectly to mine, so that's good. I have no way of testing phosphates, so that's why I took in a sample. Question... do I really have to treat for phosphates reading the results below? Everything is right on the money (patting myself on back). Phosphates they claim as high, if above 100 ppb. I just added a solar cover and noticed a spot or two of yellow algae the other day. They said that's all circulation related. Soooo.. do i go through the trouble of using Phosfree?

My test results:
FAC : 3
TAC : 3
CH : 200
CYA : 60
TA : 80 (just added up, to get to 90)
pH: 7.4
Copper : 0
Iron : 0
TDS : 950
Phos: 300 ppb (recommended below 100ppb by Leslies)

Thanks!
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
41,197
Tucson, AZ
#2
There is no reason to test for or care about phosphates.

Just keep your FC at the appropriate level for your CYA.

Don't waste money on the Phosfree. Use that money to buy bleach for the process since you have algae.

Also, forget about pool store testing and I don't think you have a good enough test kit. Throw the strips away and invest in one of the Recommended Test Kits
 

JpoC

Member
Oct 6, 2017
9
Lake Forest / CA
#3
There is no reason to test for or care about phosphates.

Just keep your FC at the appropriate level for your CYA.

Don't waste money on the Phosfree. Use that money to buy bleach for the process since you have algae.




Also, forget about pool store testing and I don't think you have a good enough test kit. Throw the strips away and invest in one of the Recommended Test Kits
Thanks! I actually use the Poolmaster test kit. Seems to work well. The strips I only dip when I'm in a rush to check chlorine real quick. I'll look into the SLAM process. Thanks for taking the phosphate anxiety away!
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
41,197
Tucson, AZ
#4
Poolmaster is likely limited to a FC level of 5ppm ... not high enough and not accurate enough. You need a FAS-DPD chlorine test.
 

domct203

Bronze Supporter
LifeTime Supporter
TFP Guide
Jun 3, 2015
3,959
CT
#5
Hi All,

Just got a comprehensive water test done at Leslie's. Their test matches up perfectly to mine, so that's good. I have no way of testing phosphates, so that's why I took in a sample. Question... do I really have to treat for phosphates reading the results below? Everything is right on the money (patting myself on back). Phosphates they claim as high, if above 100 ppb. I just added a solar cover and noticed a spot or two of yellow algae the other day. They said that's all circulation related. Soooo.. do i go through the trouble of using Phosfree?

My test results:
FAC : 3
TAC : 3
CH : 200
CYA : 60
TA : 80 (just added up, to get to 90)
pH: 7.4
Copper : 0
Iron : 0
TDS : 950
Phos: 300 ppb (recommended below 100ppb by Leslies)

Thanks!
Welcome to the forum!

The reason you are seeing algae is because your FC is too low for your CYA level.

Don’t concern yourself with the phosphates. Save your money.

Why did you adjust your TA? 80ppm was just fine. The Alkalinity Up you used is just plain baking soda.

How do you normally chlorinate?

With a CYA of 60ppm, you should be targeting a FC of 7-9ppm. I believe that is outside the range of your FC test kit.

Pool School - Chlorine / CYA Chart
 

Blake1989

Well-known member
May 18, 2012
135
Birmingham, Alabama
#6
As stated, phosphates are pointless to track. A properly well balanced pool cannot generate algae to begin with. So if you’re chemicals are in check, why add something you don’t need?