Installation Guide

For technical assistance call 1.800.621.5886 or contact your regional representative

SDX RETRO CONCRETE INSTALLATION

System Design:

SDX RETRO is an underwater suction drain cover system intended to replace any drain cover up to 10

inches in diameter. SDX is approved for single or multiple drain use. When retrofitting a SDX to an

existing installation with a single suction outlet that is not listed and approved for use as a single suction

outlet ONE OF THE FOLLOWING MUST BE ADDED IN ACCORDANCE WITH ANSI/APSP-7

SECTION 6.3. SEE EXCERPT OF CHART APPENDIX B.

Excerpt ANSI/APSP-7 Appendix B options for single suction backup:

One of these options must be installed on any single suction outlet.

• Install additional ASME/ANSI A112.19.8 Outlet with the center to center distance between the suction

pipes at least 36-inches, or on a separate plane. (see Sections 4.5 & 4.6)

• Convert Suction Outlet to Return Inlet by Changing the piping, provided the system piping and skimmer(s)

shall be capable of handling the full system flow.

• Convert to Gravity Flow System in accordance with Section 5.8

• Engineered Vent System in accordance with Section 7.2

• Install & Test. Manufactured Safety Vacuum Release System (SVRS) Tested and Listed for the purpose

by a Nationally Recognized Testing Laboratory in accordance with Section 7.1.

• Permanently Disable the Single Outlet, provided the system piping and skimmer(s) shall be capable of

handling the full system flow and minimum turnover rates are achieved.

The maximum flow rate for SDX RETRO is 200 gallons per minute (gpm) or 756 liters per minute (lpm)

Floor and 192 (gpm) or 726 (lpm) Wall. SDX RETRO should operate best when used with residential

pumps of up to 3HP. Please ensure your pool or spa pump system meets this specification.

Note: Suction Safety Standards require that main drain grates used to cover concrete sumps, must have

the suction pipe cut at least 1 ½ times the pipe diameter behind the drain cover. This is to allow room for

even water flow through all drain cover holes. This is not necessary with the SDX drain because the Patented

design provides uniform suction regardless of pipe location. However, if the pipe is too close to the surface

and off center, this may restrict water flow to the pump, reducing hydraulic efficiency, but this does not pose

a suction safety hazard.

Your SDX RETRO includes five important components; all of components 1-4 below must be used for

proper installation. These components are as follows:

1. Black drain cover support plate;

2. Drain cover;

3. Six black plastic oval slot plugs that must be installed in the drain cover support plate after it is affixed

to the pool or spa surface;

4. Three 10x7/8 security screws to secure drain cover to drain cover support plate, together with a tool

for installing these screws; and

5. Assorted screws, fasteners, and plastic spacers for attaching drain cover support plate to pool or spa

surface. See Installation Instructions below to determine which components you will need to use.