No main drain?


Mod Squad
TFP Expert
Apr 4, 2007
SW Indiana
The main drain is a high failure part of the pool, and it's usually expensive to fix if it has problems. There are some studies that indicate it doesn't contribute as much to circulation as people believe.


LifeTime Supporter
Aug 16, 2007
Ottawa, Canada
In my pool (under construction), there is no main drain. The pool builder uses a special skimmer with an integrated rectangular return called the "AquaGenie".

I haven't found much objective information on that device, only the marketing material supplied by the company.

My neighbour has a big dirty tree (tilia / basswood) close to my pool, so I'll be able to quickly see if the skimmer is as effective as claimed...

You can see a cheezy marketing video of the device here:


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
my large (but shallow...6') pool has no main drain and seems to perform just fine. If your pool has a diving section, I think floor drains make pretty good sense.


TFP Expert
LifeTime Supporter
Mar 29, 2007
Coastalish 'down easter'
Because of the 'high failure rate' of MD's the company I work for installs 2 'low suctions' in our pools. A low suction is simply a suction line ~ 28" below the water which will 'pull in' the water, it's not as effective as a MD, but you can fully winterize it! (I think Dave has 1, because he asked about a special cover for it last year).

There is a benefit to having a suction line lower than the skimmer mouth - if you want to lower the water below the skimmer, you have a line that will do that (yes, I know the ways to do it if you only have the skimmer :blah: ).

If you've any questions about the plumbing of you impending pool, ask the nice folks here and I'll bet that you will end up with a better circulatory system than your PB has planned. :goodjob:
i have one of those suction lines, with no main drain, its about 3 inches lower than the nearest return, but i have a diving well, you think they would have put in a main drain. is there a cover for it. but to answer your question, i have no main drain and i have a 9 foot deep end, so there must be some logic to it.


Well-known member
Mar 29, 2007
Ontario, Canada
I have a vinyl with a main drain.. so far so good, knock on wood. Where I find it helps is if I am just brushing I can direct some of the dirt to the main drain without having to get out the kreepy or vacuum. It also helps to determine the clarity of the pool, its white so when it looks hazy I know something is off. On opening the pool, I can run the pump as I am filling without having to wait till the water reaches the skimmer. As for mixing chemicals, I am not sure, logic would say that when I am pouring in acid or chlorine and it sinks to the bottom, it helps circulate it faster through the system. Oh yea, when I am diving, its something to aim for :)