Water clear in sight glass but pressure indicates a backwash is needed

[CelesteLincoln]

Hayward Sand Filter and pump, fresh sand, fresh fill.
Year two with my Intex and hayward set up. Just had the pool filled by delivery truck today.
Question: My pressure gauge indicates I need a backwash but when I do, the water in the sight glass is no where near as dirty as I would expect it to be, honestly it’s quite clean. After backwash and rinse is complete, the pressure creeps up again by 2-3 psi with low flow into the pool within 2 hours. I don’t recall having to do this so often last year and I’m afraid it’s an indication of an issue, any advise?

 

[duraleigh]

Did you thoroughly rinse the new sand?

 

[CelesteLincoln]

Did you thoroughly rinse the new sand?

I did the backwash and rinse as indicated in the Hayward sand filter manual upon start up of the system. Correction, upon the new sand fill.

 

[PoolStored]

Assuming that your sand filter was put back together, and working correctly...those symptoms are indicative of algae...even if you can't see it.

How are you testing your water? Own test kit? If so, do this test tonight-->Overnight Chlorine Loss Test

If you fail, time to SLAM. Link-->SLAM Process

 

[CelesteLincoln]

Assuming that your sand filter was put back together, and working correctly...those symptoms are indicative of algae...even if you can't see it.

How are you testing your water? Own test kit? If so, do this test tonight-->Overnight Chlorine Loss Test

If you fail, time to SLAM. Link-->SLAM Process

Wow, this is a fresh fill this morning and I believe the filter was assembled correctly. All instructions were followed to a “T”. Granted it is from a lake/pond but already an algae issue?
Yes I’m testing my water and adding chemicals in the correct order. As you know, I can’t add them all at once. I have only worked my TA so far, we are only 10 hours into the fresh fill. I’m away from the house right but will work on it more when I get home this evening.
My biggest concern is leaving the pump running while I’m asleep or at work tomorrow and causing damage.

 

[PoolStored]

Granted it is from a lake/pond

^^^This.

My biggest concern is leaving the pump running while I’m asleep or at work tomorrow and causing damage.

If your pressures rise like you say, then leave the pump off if you can't watch it...

 

[CelesteLincoln]

^^^This.


If your pressures rise like you say, then leave the pump off if you can't watch it...

Thank you, I will absolutely do this and work it while I’m home only.

 

[CelesteLincoln]

Looks like you were correct and I do have an algae problem! I lost 1.5 ppm of chlorine over night. I honestly didn’t think a new fill would give me such issues! Might be a long fight since I can only work the issue while home but I’ll get there! Fingers crossed this is the only issue! Thank you for assistance!

 

[PoolStored]

You can do every 2 hours at night. Even late into the night. Hard weekend of 2 hour stints will make good progress.