the z sprays can spray from 1/4 gal per k to 1 or 1.5 gal per k...I have 1gal per k in my and I leave it that bc I only treat my yard and that's it.. my jr will hold 200lbs of fert 100 in the hooper then another 100 in the trays..there are a lot of different things you can do with them also like add another tank or another pump it also comes with a hose reel with I think 50ft of hose..it also has by-pass agitation.. I think the t3000 also has that.. don't know about the pg or the ground logic.. I suggest you do a search on here and read.. there are a lot of post about the z spray and the ground logic along with the turfco t3000
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