DE in sand filter 3cups and no move

joshuaj1975

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Jun 10, 2022
85
Mesa Az
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Are you doing a SLAM? You’re saying “clearing up and more of a blue tint” which makes me think you have algae and should be SLAMming.
Are you doing a SLAM? You’re saying “clearing up and more of a blue tint” which makes me think you have algae and should be SLAMming.
Seem to have been having a filtering issue

No slam.
Always pass a oclt
3-4+ppm drop every day-0 at night

Just been trying to get rid off a brownish dust, which is gone due to vac to waste.

fc drop to 4ppm everyday I don’t think was helping anything.

Should be able to check sand level soon as I can today. I think I will need to be adding some.
 

joshuaj1975

Well-known member
Jun 10, 2022
85
Mesa Az
Pool Size
25000
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Plaster
Chlorine
Liquid Chlorine
Checked sand level. It is 14” from top of sand to top of filter edge. (Says 10” min. Required). Going to get about 3-5 more bags. Hope to see a significant change in filtering.
 
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JoyfulNoise

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May 23, 2015
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I don’t know that this is required in any sand filter but some filters recommend adding a layer of smooth pea gravel up to and over the laterals to protect them from the finer sand. Supposedly it’s to protect the laterals by giving them better support and improving the head loss of the filter. Not sure if any of those claims are realistic but given the size of your sand filter, it might be an option on the future 🤷‍♂️

Perhaps more experienced sand filter users can chime in.
 

joshuaj1975

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Jun 10, 2022
85
Mesa Az
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25000
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Chlorine
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I don’t know that this is required in any sand filter but some filters recommend adding a layer of smooth pea gravel up to and over the laterals to protect them from the finer sand. Supposedly it’s to protect the laterals by giving them better support and improving the head loss of the filter. Not sure if any of those claims are realistic but given the size of your sand filter, it might be an option on the future 🤷‍♂️

Perhaps more experienced sand filter users can chime in.
I’d be interested to hear some replies
 

joshuaj1975

Well-known member
Jun 10, 2022
85
Mesa Az
Pool Size
25000
Surface
Plaster
Chlorine
Liquid Chlorine
I don’t know that this is required in any sand filter but some filters recommend adding a layer of smooth pea gravel up to and over the laterals to protect them from the finer sand. Supposedly it’s to protect the laterals by giving them better support and improving the head loss of the filter. Not sure if any of those claims are realistic but given the size of your sand filter, it might be an option on the future 🤷‍♂️

Perhaps more experienced sand filter users can chime in.
I think in a big filter like mine that would help save on buying some sand. Because it probably doesn’t filter anything below the laterals. But since it’s already in there I’m not gonna scoop it back out. The instructions and manual don’t say anything about P gravel for this particular filter.
 

JamesW

TFP Expert
Mar 2, 2011
33,846
Gravel can help provide better flow around laterals and prevent sand from clogging the laterals or going through the laterals.

Large commercial filter will usually use gravel and some places might require it.

The quality and consistency of the sand matters a lot and if there is a lot of fine sand in the sand, then you can get sand bypassing the laterals.

You can also use a larger grained more course sand near the laterals and then a smaller sand on top.



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JamesW

TFP Expert
Mar 2, 2011
33,846
Swimming Pool Sand filters generally use #20 silica sand which is approximately .40 to .55 mm.

If the slits in the laterals are a little bit large and the sand is a little bit small, then you can get some sand passing through the laterals.[6]

MYSTIC WHITE II filter sand has three effective sizes, .49 mm, .65 mm or .80 mm.

MYSTIC WHITE® II .49

MYSTIC WHITE® II .65

MYSTIC WHITE® II .80

So, you could use 0.80 mm near the laterals and then 0.65 mm or 0.49 mm near the top.

Or, you can do a layer of gravel, a layer of 0.80 mm, a layer of 0.65 mm and then a layer of 0.49 mm on top.

 

JoyfulNoise

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May 23, 2015
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Tucson, AZ
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I guess when the filter manual says the freeboard spacing is important, they really mean it 😂 ….

Good job, great looking pool!
 
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Lake Placid

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May 27, 2021
374
St. Louis
Pool Size
17000
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Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I don’t know that this is required in any sand filter but some filters recommend adding a layer of smooth pea gravel up to and over the laterals to protect them from the finer sand. Supposedly it’s to protect the laterals by giving them better support and improving the head loss of the filter. Not sure if any of those claims are realistic but given the size of your sand filter, it might be an option on the future 🤷‍♂️

Perhaps more experienced sand filter users can chime in.
This is common in commercial filters. I’m talking about those filters the size of a twin bed or bigger and hold multiple tons of sand. I don’t recall the gravel size but it was spec’d in the manual for each filter.
 

duraleigh

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I have only skimmed this thread but I will add my filter was a TR140 that used 925 lbs of sand to get the freeboard distance correct. With a filter that size and adequate runtime it was crystal clear without the need for DE. Did you get the freeboard set?
 

joshuaj1975

Well-known member
Jun 10, 2022
85
Mesa Az
Pool Size
25000
Surface
Plaster
Chlorine
Liquid Chlorine
I have only skimmed this thread but I will add my filter was a TR140 that used 925 lbs of sand to get the freeboard distance correct. With a filter that size and adequate runtime it was crystal clear without the need for DE. Did you get the freeboard set?
Yeah. 81/2” from top. It was at 14”. 4 more bags worth.
 

joshuaj1975

Well-known member
Jun 10, 2022
85
Mesa Az
Pool Size
25000
Surface
Plaster
Chlorine
Liquid Chlorine
Ok. I see your latest CYA test was 50ppm. Did you increase that? Even with a pool cover, Arizona is too blazing hot to use low CYA.
Just been going off the chart. I filled pool, used tabs and powedered shock for first month, found tfp and been doing that. I’d say it’s closer to 45. I think I’ll throw some tabs (not sure how long it would take to raise it from 45-50 to 60-65) in unless another way is recommended…
 

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