How much you soak depends on the area you are planting.
Yields approximately as much Grass (by weight) as Grain planted. Not that your cat(s) care.
Grass will grow much better if you sprout it prior to planting!
Put seed into a bowl or your Sprouter. Add 2-3 times as much cool (60-70°) water. Mix seeds up to assure even water contact for all. Allow seeds to Soak for 8-12 hours.
Empty the seeds into your sprouter if necessary. Drain off the Soak water. Use it to water plants, or whatever you like. It has nutrients in it.
Rinse thoroughly with cool (60-70°) water and Drain thoroughly.
Set anywhere out of direct sunlight and at room temperature (70° is optimal) between Rinses. This is where your sprouts do their growing. We use a counter top - in the corner of our kitchen, but where the sprouter won't get knocked over by cats, dogs, kids or us. We don't mind the indirect sunlight or our 150 watts of bulb light, because light just does not matter much. A plant can only perform photosynthesis when it has leaves. Until then light has little if any effect.
Rinse and Drain again in 8-12 hours. And, perhaps one more... Rinse and Drain in 8-12 hours. And, conceivably one more... Rinse and Drain in 8-12 hours.
The goal is to have just the hint of a Root - or a very short Root before planting. Most of the seeds will have that hint, or have sprouted tiny (1/16 - 1/8 inch) roots after just 1 or 2 Rinse and Drain cycles.
Thoroughly moisten your medium.
Hemp Felt: Cut it to fit your Tray if necessary. Soak it in water or better yet, Kelp Fertilizer enriched water, until thoroughly saturated. Spread the wet pad across the bottom of your planting tray. Proceed...
Coconut Coir: Since Coir comes to you as a solid brick - you first have to reconstitute it - which is very easy and very cool. Once it is soil-like you may mix in up to 25% (by volume) Earthworm Castings, to provide more nutrients to your crops. Fill whatever tray you are using, 3/4 full. The only trick to Coir (with or without the worm castings) is getting the medium properly moist. Saturated is perfect. Puddles is too much. Proceed...
Spread seeds evenly on thoroughly moistened medium. Rinse your seeds one last time and then lay them across the planting medium. Spread them out as evenly as you can. We use a lot of grain and though some literature will tell you that your seeds should not ever lay atop each other, we have found from years of experience and thousands of trays of Grass grown that that is bunk! You will learn for yourself that Grass produces a plant that takes up less room than the grain did, and so to maximize your yield your seeds must lay atop each other to some degree. The thing to watch is this: If you find mold or fungal problems in your Grass then lessen the amount of grain you plant. The hotter/more humid your climate is the more of an issue the mold/fungus is. As always, you need to adapt to your own climate and seasonal conditions. You will learn as you go. This is really easy and fun stuff to learn!
Cover the planted tray with an inverted tray (i.e. the Cover Tray) - to keep light out and moisture in. By inverted I mean that the lip of the Cover Tray rests directly on the lip of the Planting Tray - so the bottom of the Cover Tray is facing up.
Note: Your covering tray should have holes or slits in it so that some air circulation exists
Place in a low-light, room temperature location. 70° is always optimal but Grass will grow very well in cooler temperatures also.
Water lightly once or twice a day, for the next few days. The goal is to keep the sprouts moist until their roots bury themselves in the soil/medium - at which point your goal is to keep the medium moist. Spraying the sprouts is best - whether you use a Spray Bottle or sink/faucet sprayer - just try to make sure that every sprout gets rinsed and quenched until they bury their roots. You may also use some Kelp Fertilizer if you like.
Water the medium. Once the roots are buried, all you need to do is keep the medium moist - the seeds and subsequent Grass will get the moisture they need through their roots. Water from the side if possible, to prevent injuring the tender blades.
Hemp Felt will dry out more quickly than a deep medium, so you should either water more often or experiment with our somewhat risky trick:
Use the Drip Tray to hold some water. The roots will actually sit in this, so don't go crazy - too much can drown your plants and/or lead to fungal or mold problems. Just leave as much water as the Grass can drink in a day - and then add more the following day. The amount is dependant on the climate (humidity especially) you're growing in, so you'll have to learn this for yourself. We suggest that you start with 1-2 cups in the Drip Tray. Lift the Planting Tray to see how much is left after 4, 8 and 12 hours. If the Drip Tray is dry - add more water - if there is still water 24 hours later then cut back the next time you add water. Pretty simple really, and not as risky as we make it sound - it is really a time saver and can produce happier healthy grass. Leaving too much water for too long will lead to funkiness. The roots can go brown, and the smell will be unpleasant. Just keep an eye open and use common sense. Be the plant!
Once again, we do recommend Kelp Fertilizer enriched water for soilless growers. Soil growers may use it too of course, but the soil does have some nutrients already, so it is not nearly as important for you. If you are using Coconut Coir and have added Earthworm Castings you have no need for kelp.
Greening your Grass
Uncover your Grass on day 3, 4 or 5 - or whenever it's 1-2 inches tall. We usually wait until it pushes the covering tray up (it really will do that!)
Move to a well lit location.
Direct sunlight is a very good idea for Grass. Keep your medium moist. The bigger your grass grows the more quickly it drinks water.
Watch it grow. It takes about 4 or 5 more days to get to....
This is pretty much up to your feline family. We put the tray where we want them to graze - or where they want us to put it really - and they graze when they want to.
Keep it moist. That's really all there is to it. As with all Grass, you can try to grow a second crop, but let's face it - subsequent crops are never as tender or lush - so unless you have a cat who will accept that, don't bother =;-)
Amount of Seed to Use
If using Sproutpeople's Single Harvest Pack - use the whole bag on our 5 inch tray (or similar).
Or Use: 1/4 - 1/3 Cups Dry Grain for a 5 inch square Tray.
1 - 2 Cups dry grain for an 10 inch square Tray.
2 - 4 Cups dry grain for for an 10 inch x 20 inch Tray.
The surest way to know what amount of seed to use: Spread dry seed on the bottom of your Tray so that the seed is spread evenly but densely.