In the interest of making better plans for my future work with our pool, I'd like to get confirmation of the size of the pool... I had thought it was 16K gallons, but looking at some of our old pool store chemistry reports (from one of those dreaded computer programs) they were saying 17K. I think this is what the pool store had estimated based on a sketch I gave them.

I have also done a drawing of the pool in QCAD, which is a semi-open source, low cost CAD drafting program that is supposed to be mostly Autocad compatible. I have attached a .PNG export of the drawing, unfortunately the forum won't let me attach the actual .dxf file that QCAD uses. (If anyone would like the .dxf file, send me a PM w/ an E-mail and I can get it to you directly)[attachment=0:22izq9g8]cad-layout.png[/attachment:22izq9g8] I think the drawing is pretty accurate, but I may redo it this summer to be sure...

The surface area numbers are calculated by QCAD using it's built in "polygon area calculator" and tracing around the perimeter of the drawing.

I've tried to calculate the pool volume using those surface area numbers, and I get answers ranging from 17,870 to 25,391 gallons, without allowing anything for the steps, or the fact that the bottom and sides of the pool, plus the dropoff are radiused a lot.

BTW, there is a bit of ambiguity in the Pool Calculator - it saysDoes this mean "(shallow end depth plus the deep end depth) divided by two" or "shallow end depth plus the (deep end depth divided by two)" - it makes a difference...If the depth varies, use the average depth of the pool. A good approximation is the shallow end depth plus the deep end depth divided by two.

I got the 17,870 number by assuming an average 39" depth for the shallow end, and calculating the volume of the shallow end, plus the volume of the deep end; and adding the two numbers. Making a wild guess at what I loose to the volume of the steps, plus the curves on the bottom, makes the 17K figure from the pool store sound about right - can anyone confirm or point to where I am making a mistake?

FWIW, I currently have a 1hp pump, and a 36sq ft DE filter rated at 72gpm max flow, does this seem like an appropriate size equipment setup for the pool?

Gooserider