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Thread: Pool backwash is draining into our septic, advice please!

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    Pool backwash is draining into our septic, advice please!

    We have a large IG pool that is about 3 years old, as is our septic system. After having problems with our toilets/showers not draining twice in the past 6 months, we had it roto rootered and a camera put down our sewer line and they saw that there was a mortar like substance partially blocking the line. Turns out the pool builder connected the backwash to the septic line at a 90m degree angle and at that juncture is where they found the substance. It is hard as cement and I assume it is DE that has settled and solidified over time. Has anyone else run into this issue? Can you give me guidance/insight on this? Is it common for pool builders to do this, or against code I am assuming? Unfortunately we have no recourse with the pool builder because they have gone out of business to no one's surprise.

    The septic company told me that I need to have that piece of line replaced and have the backwash line diverted elsewhere. Suggestions?
    gunite pool with exposed aggregate finish 54'X25' freeform with raised spa
    SWG, 60 sq ft DE filter, 5 hp waterfall/bubblers pump, Pentair VS main pump
    Houston TX

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    Mod Squad jblizzle's Avatar
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    Re: Pool backwash is draining into our septic, advice please!

    I would NEVER suggest that a DE filter be backwashed into a septic system ... All that DE is certainly going to clog up things. Hopefully it is only in the tank and did not manage to get out into the leach field and clog things up out there too.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Pool backwash is draining into our septic, advice please!

    I would remove that backwash line completely.

    Then switch to Fiber Clear or one of the other cellulose filter media, and backwash onto the lawn. My lawn seems to thrive on it, and it's just really refined sawdust.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pool backwash is draining into our septic, advice please!

    I did have the backwash line removed and connected to a drain which goes down to the street. I guess there is apparently a belly in the septic line and they need to replace it. Has anyone ever heard of DE settling and becoming hard like mortar? We will see what is really going on when they dig up the septic line this week.

    I am concerned that the DE will now settle at the bottom of the yard drain it is now connected to and will clog up that line as well. Maybe it won't be a problem as long as the line is graded properly?

    I will look into the Fiber Clear, have never heard of it before.
    gunite pool with exposed aggregate finish 54'X25' freeform with raised spa
    SWG, 60 sq ft DE filter, 5 hp waterfall/bubblers pump, Pentair VS main pump
    Houston TX

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    bobodaclown's Avatar
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    Re: Pool backwash is draining into our septic, advice please!

    You may want to get your septic tank pumped. Get the DE out. You don't want clogging up the leach/drain field.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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