![]() ![]() The other application where grinder pumps may be used is as part of a cluster system. Effluent pumps should not be used for this purpose, as they are only used with effluent that has undergone primary settling, such as in a septic tank. This will allow for better separation of the small solids that are being applied and will reduce the energy in the flow stream. When effluent is being delivered via a pump into the septic tank, the septic tank capacity is recommended to be increased by 50 percent of what would normally be required by state or local codes, with multiple compartments and an effluent screen and alarm. This will allow for maximum energy reduction before entering the septic tank. Also, the pumped effluent should be delivered into the collection piping as far away from the septic tank as possible. It is recommended that each dose into the tank be between 1 and 5 percent of the total septic tank to limit turbulence. In these applications, minimizing the dose is important to allow for separation in the tank. These pumps are also used to lift sewage into the collection line or into the septic tank placed at a shallower bury depth. ![]() Since all sewage must pass through the grinding mechanism, a grinder pump may experience blockage as the grinding mechanism becomes dull or is clogged by foreign debris. In grinder pumps, a rotating blade shears or grinds sewage into smaller particles before pumping it. The second type of application is a sewage ejector or grinder, which is used to lift the wastewater in lower levels of the home into the system. These should never discharge into the soil treatment system and the discharge should even be directed away from the system to avoid additional water to the system. Sump pumps deal with the footing drains and other clean water sources. Sump, grinder and ejector pumps in the basement are used for two different types of pump applications: clean water or wastewater. The vast difference in price makes me think they are not and are two vastly different systems.Get Pumps articles, news and videos right in your inbox! Sign up now. ![]() In your case it's impossible to comment about the prices your seeing since we know nothing about what you are considering or even if the $500 and $7'000 units are an apples to apples comparison. There is no harm if it takes several minutes for the ejector pump to empty the sump. If you move too much too quickly it can cause a backup problem in your main house if the gravity system cannot take the waste away fast enough. Don't fall into the trap believing that bigger is better. You will also want to consider the flow volume coming out of your pump. So, if you have a 2" outlet from your pump I'd run 2" all the way to where it ties into your main drain stack and becomes a true gravity flow. Parts of the run may operate by gravity by coincidence but it's primarily pumped the whole way. There is no simple lift where it dumps into a gravity flowing line. In all cases with an ejector pump I pump it all the way. I've had to replace two float switches but that's a relatively minor expense. It's currently in it's 14th year on the original pump. I have a twin tank septic system with a pump that moves everything to the leach field. (x-post from Help with sewage ejector: what kind, and what configuration? - Plumbing Forum - Professional & DIY Plumbing Forum) PS: In case someone suggests tying into the side sewer rather than the waste stack in the house: the reason this isn't an option is that where I live (Seattle), the county will charge you a $10,000 hookup fee if you connect a detached dwelling to the side sewer anywhere after the cleanout. Do I put the ejector immediately outside the MIL, have it pump waste vertically a couple feet, and then have a normal gravity sewer line from that high point to the house? Or should I use the ejector to set up essentially a pressure sewer system for the entire 60' distance from the MIL to the house? I have seen both configurations but can't find any info about when to use each (probably because I don't know the right nomenclature). I also have questions about configuration. The MIL is a small studio, with a 3/4 bath, kitchen sink, and washing machine. ![]() So I need a sewage ejector, and I have very little context for understanding the difference between a $500 unit and a $7,000 unit. the point where the waste line exits the MIL is about level with the cleanout at the bottom of the basement floor, so I can't use a normal gravity sewer. The MIL's main waste line will tie into the waste stack in the main residence, which exits the basement floor. I'm building a detached MIL unit in my back yard. ![]()
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