The Simrek Multiport Drive Shower system comes
with a built in two stage water filtration system.

A stern drive cooling system will not be of much value to you if it plugs up with the debris that is normally found the water. How do you know if your drive shower is plugged? How many times are you willing to hang over the back of your boat while it is under way to make sure that it’s still working? How are you going to remove the twig that is stuck in one of the bends near the top? What about the growing problem with Zebra Muscles? These are all serious questions that you should be asking when it comes time to select a drive cooling system.

Simrek’s two stage filtering system:

For you fresh water people --- yes it will filter out Zebra Muscles.

We at Simrek realize that designing our system to include a two stage filtration system may cut down on the efficiency to a small degree. We believe that giving up a little water flow is well worth it, if it keeps the shower from plugging up and failing all together. Instead of cutting the end of the tube off square and welding a round plug into the end as we currently do, some of our earlier designs included cutting off the tube at a 45 degree angle and welding in an oval plug. Our earlier drawings of this concept looked like the sketch on the left. We also were very tempted to finish the bottom of the tube similar to the sketch on the right. Simply bending the tube and cutting it off at an 80 degree angle is a much less costly way to make a pick-up port. The reason that we chose not to take advantage of the increase in the amount of water flow and the cheaper cost to manufacturer is this; these designs are both very susceptible, and even encourage, debris to enter the cooling system. Once inside, debris like twigs will get trapped at one of the bends in the tubing, and smaller objects will lodge themselves in one of the dump ports.

We at Simrek chose to take advantage of the natural filtering that comes with our 90 degree system. Some of our earlier designs also included a sleeve or washer welded to the outside of the tube to locate the shower on the top of the cavitation plate. We found that switching to a pin not only increases the number of contact points on the cavitation plate but it also divided the tube in half. Because our dump ports are larger than ½ of the tubing diameter, anything that can get past the pins will flow out the dump ports.

We also experimented with incorporating smaller nozzle like dump ports, and slots instead of holes to make the port more like a fan. Both of these concepts led to the system plugging up with debris. Even seaweed had becoming a serious problem for the smaller ports.