Quote Originally Posted by sivs1 View Post
I'm following this thread, I don't want to derail it, but am curious if what I am thinking would work. Right now I have the GIII system but with upgraded bags all running off the standard single pump and sprinkler valves.

Here's what I'm thinking, if I replace the sprinkler valves and single pump with three of these pumps; http://www.amazon.com/Attwood-Corpor...s=tsunami+pump

Can I use the single thru hull intake? do I need an intake for each pump?

At this point I am trying to piece this together as funds are available. Having a baby and building a house all while trying to make my GIII system better.

Thanks for you input
First off, I found out that there's two styles of Tsunami pumps. The ones on ebay and amazon are typically the ones that have the weird 1 1/8 thread that you can't find hardly anything to mate up with. The ones that wakemakers sells are a smidge more expensive, but they have the inlet that's 1" NPT and that's TOTALLY worth it because it'll screw directly into a 1" ball valve or an elbow or whatever typical plumbing stuff you're using from the thru hull.

What I found is that our Factory intake is a "scupper" and would have forced water into the pumps even when they were turned off.

I chose to go with dedicated thru-hulls for each of my 3 pumps. I could have possibly gone with fewer and a Tee, but I wanted to do it right from the start.

I am finding that had I gone with reversible, it would have most certainly made for an easier install. I'm still okay with my decision, because I do think I'll still have a faster system in the end, but the cost difference between reversible and aerators (if you're upgrading your hoses and everything) starts to narrow. especially when you have to make trips to the plumbing store for more pieces. The factory thru-hull with the scupper could be reused with a reversible pump.

The pumps off ebay and amazon with the 1 1/8 on the intake are fine for your drain pumps though.

I chose to have separate thru hulls for my drain and vent also, because it was cheaper to buy another thru-hull than to buy a Tee and a check valve.


Honestly it's hard to piece together an upgrade because I've found that if you simply upgrade to 3 pumps, you'll have to deal with the scupper forcing water through them when off (i.e. new thru hulls or grinding off the fins of the scupper) and you'll also have to deal with whether the 3/4" thru hull is really enough for 3 pumps at once. Then you're hooking 3/4" hose to the pumps... If you ever decide to go to larger diameter hose (1" or 1 1/8") then you're possibly having to replace some of the fittings you just bought.

I did contemplate going with 1" lines on the fill side and then 3/4 on the drain side, because then I could reuse a lot of my 3/4" bag fittings and stuff on the drain side and save a little bit of money that way... But in the end, I'm leaning towards going with bigger lines all around, even if it means I'm blowing a little more money on the front end.