Filter Stain

[chriswitty]

Any idea what this stain is and is it problematic to keep using this filter?


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Build Type: Plaster
Volume: 18060 gallons
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Latest Test Result Summary:
FC: 4.0 (an hour ago)
CC: 0.0 (an hour ago)
pH: 7.8 (an hour ago)
TA: 100 (an hour ago)
CH: 150 (an hour ago)
CYA: 19 (an hour ago)
SALT: 3200 (an hour ago)
TEMPERATURE: 83° (an hour ago)
CSI: -0.13 (an hour ago)

 

[Texas Splash]

That filter looks like it's on its last leg. But I have a couple questions before we try to advise you:
1 - Are those your test results from a TF-100 or Taylor K-2006C, or form somewhere else?
2 - Are you on a well out there in Canton?
3 - You have an SWG, is that the only way you chlorinate? Have you added anything else to the water?
4 - How does the rest of the pool/water look? Any staining, green, or cloudiness?

 

[chriswitty]

TF-100

City water

SWG only, but I did shock two days ago

Clear now, but was having cloudy problems. Filter had been cleaned several times recently, but with still high pressure; next step is to TSP them unless they’re done as you suggest

Thank you

 

[Texas Splash]

Okay. Given the additional info provided, I'm inclined to think the filter is covered with staining from organics - algae. Your CYA is very low for a salt pool and normally should be at least 70. But I wouldn't try to raise it now. I suspect with recent cloudiness and that very low CYA, algae began to form but was never completely killed/removed. The high filter pressure is also indicative of organics being captured consistently, overwhelming the filter. I would recommend a SLAM Process.

Lower the pH to 7.2 and increase the CYA to "30". Then increase the FC to "12" and maintain that SLAM/shock value of 12 until you pass all 3 SLAM Process criteria. The cartridge, while worn and stained, might even clean-up a bit during the SLAM. If not, you can always replace it afterwards. But I would do the SLAM now and see how things go. But make sure to refer to that SLAM Process page daily so you don't miss anything.

 

[chriswitty]

Thank you