I think it is a bad idea to spray grey water. You are more likely to get any nasty stuff airborne and into people's lungs.

Fluff, spray irrigation systems do not produce a fine enough aerosol to make it into the terminal air ways of your lungs. So I doubt very much whether sending grey water out through the irrigation system would produce any health effects for the average gardener.

If you that susceptible that the type and small quantity of bacteria in the grey water effects your health then you could jsut as easily suffer as a result of the bugs in the soil that you handle.

Obviously I would not recommend putting grey water out a spray irrigation system on to the vege patch. Ingesting the bugs, apart from the laundry chemicals, is a whole different matter.

Most people will already have these sorts of Irrigation systems in their gardens so this is a very easy and cost effective method of distributing the grey water.

I was reading about the spray issue here yesterday. It was linked to from one of my website's reciprocal links:

http://oasisdesign.net/greywater/misinfo/index.htm#health

If you want cost effective, go with a gravity feed and water one spot at a time. Even if you get a pump, you are more likely to have clogging issues if you use sprayers. I have a micro irrigation system that I used to hook up to the mains. Now I just use a gravity fed grey water system.

Have been there and done that with gravity feed, for several months in fact.

Problems with it are that:

1) The trough does not drain quick enough and tends to overflow if you are not watching it. And if you don't have the hose just right water may not drain through it at all.

2) It is very difficult to water the garden beds evenly. Water tends to drain away through any cracks in the soil leaving areas of bone dry soil in close proximity to the end of the hose.

As far as clogging goes. An inline filter between the trough and pump catches all the lint and prevents it reaching the sprayers. Additionally you can add a drain sieve to catch some of the lint and save your from cleaning the inline filter as frequently.

What sort of 'trough' are you using? I have an S bend under the bathtub with a drain hole at the bottom with a regular thread on it so I can connect a garden hose. It is good because if the hose doesn't work it just goes down the regular sewer drain. I do need to upgrade to 3/4 inch hose because it doesn't drain fast enough. At the moment I put a platic lid with one 8mm hole over the plug hole to slow the water down a bit. I also have problems with it not draining for the trees that are on higher ground.

http://www.ozpolitic.com/gardening/water.html

Here is a link that might be useful: on my site

Fluff - I purchased a grey water diverter, which you fit into the outlet by removing the inspection plug on the bend where the waste pipe comes through the wall. It's just a matter of removing the plug, then fit the soft rubber funnel end of the diverter into the pipe. This leaves the hose size end sticking out which you can have run into a tub etc to catch it. We have a 100lt tub and divert the soapy wash water from the washing machine back into the system and catch the rinse water in the tub. We just use a bucket and move the water to the plants.

I installed some of those soft rubber funnel things at a relative's place, with a garden hose attached taking it straight to the garden. Unfortunately they kept getting small frogs stuck in it and drowning, but I upgraded that to 3/4 inch hose and the problem went, plus it drains faster. That is only a very short hose with a decent drop on it.

That would suck having to use a bucket all the time.