Sump drain design (Spa-flex) - yea/nay? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 08-14-2013, 07:21 PM Thread Starter
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Sump drain design (Spa-flex) - yea/nay?

Hey everyone, I'm looking for some input (no pun intended) on how best to design the drains for my 125 project.

Had a change of plans, could not re-use my old Beananimal drain system, so I'm building another one, but will be using Spa-Flex (flex PVC) instead of rigid pipe.

The path for the primary siphon looks like this:
  • Downturned 90 (inside overflow)
  • 1.5" Bulkhead
  • 1"-1.5" Adapter
  • 90 facing down (not incorporating cleanouts this time around)
  • Ball valve (gate valve still too pricey)
  • 1.5" Spa-flex
  • ?
  • Sump drain dump area (sealed)

I'm thinking the '?' part would look like this:
  • 1.5" 45-degree to accept Spa-Flex (attached to sump lid)
  • Sump lid
  • Rigid 1.5" piping, enough to get below designed surface of dump area

The lid would be acrylic (less likely to break due to having 3x 1.5" plumbing attached), and would then be sealed (somehow) to reduce CO2 off-gassing.

Sound about right?
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post #2 of 4 (permalink) Old 08-15-2013, 01:40 AM Thread Starter
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No worries, I think we're good. Did more reading, seems to have been done before with success.

If you're curious how it turns out, I'll be documenting progress in my tank journal here:

FYI, Spa-Flex (flex PVC) is designed to be used with slip fittings, albeit with a different glue, so it should fit into the ball valve and 45-degree elbow no issues.
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post #3 of 4 (permalink) Old 08-15-2013, 02:14 AM
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anytime ive used flex pvc (pool plumber for 7 yrs) ive only ever used pvc primer and pvc pressure glue and never had a failure. You may find some more resistance when you first put the pipe into the fitting but just use lots of glue and hold it together for a minute untill its set.

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post #4 of 4 (permalink) Old 08-15-2013, 12:45 PM Thread Starter
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Ha, that's funny - I did in-ground pool construction for 3 summers in high school. The 'hold together for a minute' trick I knew, the using regular glue I did not (can't really remember that far back now...). Cool, thanks!
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