Pool is turning green

[ald2002]

Hi there - Pool was blue this am. I went outside during lunch and it is now turning green see photo. See photo of the color on Sunday. Rained yesterday and I tested and added acid and ran SWG all night to raise chlorine. Also, see photo of test results. Is my FC too low? What next? Thanks.

 

[Texas Splash]

You ran the SWG all night to raise the FC, so that would indicate it was below the FC of 4.5 previously? If so, it sounds like algae bloomed with the low FC level. But if the water is an unusual clear green that started once the FC and pH were elevated today, it could be iron. Are you on a well? Maybe show us a pic of the water as you see it today?

 

[ald2002]

Hi there - Pool was blue this am. I went outside during lunch and it is now turning green see photo. See photo of the color on Sunday. Also, see photo of test results. Is my FC too low? What next? Thanks.

You ran the SWG all night to raise the FC, so that would indicate it was below the FC of 4.5 previously? If so, it sounds like algae bloomed with the low FC level. But if the water is an unusual clear green that started once the FC and pH were elevated today, it could be iron. Are you on a well? Maybe show us a pic of the water as you see it today?

FC was 2.5 yesterday. I am sorry -photo posted is from today. Not on a well. Had iron stains on skimmer removed with vitamin C last week. Pool guy put in A plus 6oz last week.,

 

[ald2002]

FC was 2.5 yesterday. I am sorry -photo posted is from today. Not on a well. Had iron stains on skimmer removed with vitamin C last week. Pool guy put in A plus 6oz last week.,

It was blue this am and several hours later it is green.

 

[Texas Splash]

It was blue this am and several hours later it is green.

Based on the skimmer and A-Plus product used, it sounds like you do have some iron in the water, but I cant quite tell if that's the reason for the green (clear) water you are seeing. An FC of 4.5 isn't real high, and the pH isn't too high either, both of which could impact iron. So I would first do an Overnight Chlorine Loss Test first to rule-out algae. If you pass the OCLT, then you know iron is reacting quickly, perhaps because the iron content has been increasing over time. Of course if you fail the OCLT, then you know it's algae and need to perform a SLAM Process.

 

[ald2002]

Based on the skimmer and A-Plus product used, it sounds like you do have some iron in the water, but I cant quite tell if that's the reason for the green (clear) water you are seeing. An FC of 4.5 isn't real high, and the pH isn't too high either, both of which could impact iron. So I would first do an Overnight Chlorine Loss Test first to rule-out algae. If you pass the OCLT, then you know iron is reacting quickly, perhaps because the iron content has been increasing over time. Of course if you fail the OCLT, then you know it's algae and need to perform a SLAM Process.

Thanks. Does algae generally move when brushed? If so I brushed and nothing is brushing off the walls and floor.

 

[Texas Splash]

Does algae generally move when brushed? If so I brushed and nothing is brushing off the walls and floor.

Yes. Algae that has settled will brush-up like a cloud. Some algae can get suspended in the water and start to get cloudy. In your pic above, the water looks crystal clear which concerns me about iron. If you have anymore sequestrant you could add it and see if that helps. Or you could try placing some polyfill in the skimmer to try and capture some of the iron.

 

[ald2002]

Yes. Algae that has settled will brush-up like a cloud. Some algae can get suspended in the water and start to get cloudy. In your pic above, the water looks crystal clear which concerns me about iron. If you have anymore sequestrant you could add it and see if that helps. Or you could try placing some polyfill in the skimmer to try and capture some of the iron.

Ok! Thanks. Will add more sequestrant.