I am not sure if I would claim it to be the best... To be the best it would be superior in all possible ways. Maybe you meant to say it is the best value. Admin, you mention its the most effective. I would like to see the results/data that show its more effective than any other product. You also mention spike, but you dont call out specific products.
One thing I noticed is that the fertigator seems to be trying to make profits after the install of the system. This was not always the case.
If you want the original pdf file (google search fertilizer_info.pdf) from fertigator website that provided other fertilizers that could be used within their system. Now, any product that is used besides theirs voids warranty.
If the pdf file is removed here is the contents
Ewing Liquid Fertilizer - Use the 16% nitrogen option except on Centipede. Available at all Ewing
Irrigation wholesale stores located throughout the Southwest. Dyna-Gro - Use 10-5-5 liquid fertilizer. Californian products available in many Western wholesale
and retail locations.
Green Pro - Nice multi-part liquid line for the Midwestern growing season. Available at several
Northern wholesalers and retailers.
Grow More - Highly soluble powder. Use the 36-6-6. Put 3.5 - 4 pounds in a one-gallon
container and ill with warm water. Southern California manufacturers products are available in
some wholesale landscape stores.
LESCO - Use the 18-3-7. They also have many other liquid products available at LESCO stores
and some Home Depots nationwide.
Liberty Acres - Makes a nice line for Centipede and other Southeastern US warm weather grasses.
Available at many Southeastern retailers.
NatureGrow - Use the 16-4-4 most of the time. Repel is excellent natural pest and mammal repellant
for grubs, deer, moles, ire ants and even armadillos. Available at many wholesale distributors and
throughout Florida and Georgia.
Peter's Pro - Use 30-10-10 powder available at most Lowe's and in many landscape wholesale
stores. Put 3 - 3.5 pounds in a gallon jug and ill with water. It should dissolve easily when stirred.
Works fastest with warm water.
The FertiGator is designed to deliver virtually any liquid or highly water-soluble fertilizer or lawn care
product.
Fertilizer Information
Products Should Be:
Relatively clean (they should low through a 100 mesh screen)
pH level above 4
High in urea nitrogen for turf (other than centipede) - ideally above 14% nitrogen
Water soluble fertilizers must remain in solution once mixed and should mix at least
at the rate of 3 pounds in enough water to ill the rest of a gallon jug (3.5 pounds to
the gallon)