Here's what I want to do, I want to fill up a 100g container with water from my 180g and my 40g from weekly water changes. Once container is filled, I want to water my lawn with the old water, but with a hose and nozzle. It's only a 15'x15' section of lawn, so the pressure would not have to be crazy. Any suggestions on pump? Either submersed or outboard?
I did something similar when we were in a drought here in Georgia a couple years ago. We even kept washing machine water. I just used a 1200 GPH pond pump I had and rigged it for a water hose. Worked great. I was going about 100 feet with the water so you may not need a pump that big. Look for SunSun pumps on ebay.
I'm using a pond pump for my water changes, I think mines right at 400 GPH and it has a fair amount of pressure. It has a threaded 1/2 in connection that you could change to garden hose to do your watering I think your overall cost would be 25 for the pump and 5 for the adapter.
My garden hose is done via the included barb and a hose clamp because I think garden hoses leak to much for my indoor use. If you want an actual connector so that you don't need to cut your hose Id say these would work