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    DE filter requiring constant backwashing

    I've now been running on the same DE powder (9.5 of my blue scoops) for 4 weeks with no signs of backwashing needed yet. Running a higher FC (no lower than 4.5) made all the difference.
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    Hayward AquaVac 500 stops after a few minutes

    Thanks! Ended up selling it for parts for $100 and picked up a new Pentair Warrior SE (aka. Dolphin S200).
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    Hayward AquaVac 500 stops after a few minutes

    My Hayward AquaVac 500 robotic cleaner (new in August 2017) will only operate for a few minutes before stopping completely. Everything looks normal when I plug it in. I select wall or wall+floor mode, the control panel lights go solid, the impeller spins up, and the robot will drive around for a...
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    Re-plumb to improve flow rate?

    90% was needed before I adjusted the pressure switch. 70% does the trick now, but I had to adjust the switch to its minimum limit.
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    Re-plumb to improve flow rate?

    It's not quite that bad. 2400RPM (40GPM) seems to keep the pressure switch happy. The 25GPM flow switch definitely sounds like the way to go though. Thanks!
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    Re-plumb to improve flow rate?

    I just added a FlowVis flow meter right after the pump, and am currently seeing about 69 GPM at full speed, with a filter pressure of about 9 PSI. Based on the chart above, TDH is about 32. A 24/7 pump speed of 55% gives me 33GPM, which is spot on for 3 turnovers a day. TDH at this speed looks...
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    DE filter requiring constant backwashing

    That'd be great, thanks!
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    DE filter requiring constant backwashing

    Interesting. That orange scoop seems to be 50% more volume than my blue devil scoop. If that's the case, then I should be adding 9 scoops (about 1 scoop per 5 sqft of filter area, just like it says on the bottom).
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    9c7c0414-4ff9-4512-a5d7-34ac54e8cc24.__CR0,0,970,300_PT0_SX970_V1___.jpg

  10. what-in-the-****.jpg

    what-in-the-****.jpg

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    DE filter requiring constant backwashing

    Any idea what the actual volume of this orange scoop is? My "Blue Devil" 1lb scoop holds about 1 liter of water. Interestingly, I just talked to Hayward's support line, and they told me the 6lbs in the manual was actual weight of DE, and not volume. They didn't seem to know anything about DE...
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    DE filter requiring constant backwashing

    I think baseline is about 8psi for me (equipment pad is about 6' above water level). I'll check out the slime bag, thanks! Sounds like the same idea as a skimmer sock.
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    DE filter requiring constant backwashing

    Crud. This would mean I've been adding about 60% more DE than required. Not sure why the scoop says 1 scoop per 5sqft of area. I'll try with 6 scoops and report back!
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    DE filter requiring constant backwashing

    This one holds about 360g, so if Hayward's "recommended amount of D.E." of 6lbs by actual weight, it'd be about 7.5 scoops.
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    DE filter requiring constant backwashing

    I'm using this blue scoop, which states 1 scoop per 5sqft of filter area. I always thought the Hayward manual was saying 6 actual pounds of DE by weight.
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    31Ehc6jWhvL._AC_SY580_.jpg

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    DE filter requiring constant backwashing

    That's nuts! Do you have a lot of stuff that falls/blows into the pool? I back on to farm fields, and the wind whips across them bringing all kinds of crud. I'm hoping the skimmer sock will catch most of that now.
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    DE filter requiring constant backwashing

    Was wondering that as well. That would require like 6lbs of cal-hypo! I've only ever used two at a time before.
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    DE filter requiring constant backwashing

    Thanks. So the pool shop salt measurement is not reliable? I believe they use BioGuard ALEX for their testing.
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    DE filter requiring constant backwashing

    That's brutal! are things any better for you this year? My water looked great when I took the winter cover off in late April, and has looked perfectly clear since (after I gave it the initial 2lbs of cal-hypo after filling).
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    DE filter requiring constant backwashing

    Just got my levels tested at the pool store (still need to get my own test kit): pH: 7.6 CH: 288 TA: 114 TDS: 1100 CYA: 83 FC: 2 TC: 2 Salt: 2900 A I correct in assuming that CC = TC minus FC? The pool store said "your levels are basically perfect"... :ROFLMAO: clearly not the case. So at...
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    DE filter requiring constant backwashing

    Hmm good to know, thanks! I guess an FC of 2-3 doesn't provide enough of a buffer for hot sunny days? SLAM doesn't include algaecide, you're right. My thinking was that the chlorine would do a better job if supported by algaecide (in case algae is indeed a problem).
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    DE filter requiring constant backwashing

    Thanks Jim, I'll report back once I know my current levels. Pump runs 24/7, and I keep FC around 2-3. If I fail an OCLT, will SLAM/algaecide "unclog" the filter, or would I need to replace the DE?
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    DE filter requiring constant backwashing

    I've seen claims of pool owners with DE filters going for months between backwashes, but find that I can only manage 2-3 weeks at most before I start to see a large air pocket in my pump basket and a reduction in flow (to the point where the heater can't fire). Thinking my grids were gunky, I...
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    Air in pump basket

    I run my pump 24/7, and found it looking like this after running overnight at 60% speed. There was no air in the pump basket when I looked 10 hours prior. I did a full disassembly and clean of the DE filter exactly 2 weeks ago (sprayed down the grids, soaked with dishwasher tabs, rinsed, then...
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    Re-plumb to improve flow rate?

    Looks like my heater is 250,000btu/hr. Think I could I get away with running an additional wire off the existing SWG flow switch to the heater?
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    Small, occasional bubbles at lower gpm

    Yep, hydrogen bubbles!
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    Re-plumb to improve flow rate?

    Would I just replace the part after the SWG with a 2" section and 2" tee, and use a 2" to 1.5" adapter on the returns?
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    Re-plumb to improve flow rate?

    Yup, this was from scratch. I feel like he just used whatever parts he had at the time. The check valve was added later on (but probably should have gone ahead of the pump somehow).