Roma, Focca,Zote, Ariel (non HE version) and other assorted laundry detergents from Mexico are sold all over the United States, espeically in areas with high Hispanic populations. Our local K-Sears has an entire shelf of Mexican laundry products, including the ones named above. All contain phosphates and unless stated for use in front loading washers, are for the most part highly sudsing.
Mexico's environmental/sewage laws are not nearly as strict as those in the United States (one not too small reason many "dirty" factories have relocated production under NAFTA south of the border), and phosphates are not restricted in any way.
Focca is designed for top loading/wash tub laundry, so you will just have to find the correct dosage. Personally think "Focca" and the rest are nothing better than "dollar store" detergents. Lots of phosphates, washing soda, perhaps some surfactants, perfume (usually lots) and that pretty much is about all. Then again any detergent high in phosphates is going to clean well and probably does not need the complex chemical cocktails developed to replace phosphates.
Phosphates and the United States:
Phosphates were not banned nationally, but each state had passed laws restricting or limited use of phosphates in residential laundry detergents. Commercial laundry detergents along with automatic dishwasher detergents were and still are exempt from these bans.
Phosphates are easily treated out of sewage, but that involves local areas spending money to update sewage plants. Many thought the ban on phosphates in laundry products would do the trick, but phosphates are naturally excreted by humans (and also used in meat processing), along with the fact so many homes have dishwashers these days plant upgrades became necessary anyway.
Residential laundry detergent makers began to consolidate production of their products and it was no longer cost effective to produce several flavors of detergent, each with varying phosphate content to satisfy local laws. Thus, phosphates were phased out entirely and replaced with the chemical cocktails we have today in laundry detergents.
Have some Ecolab commercial laundry detergent, which contains mainly only phosphates (STPP), washing soda, surfactants and am here to tell you for laundering bed linens and towels it rocks. According to the label it is made for "greasy and oily soils", and sold to commercial laundries for bed linens and towels. It is very low sudsing, when one has the dosage correct, but it is designed to be dispensed/calibrated automatically. One half ounce will launder 5kg of wash in my front loader.
Despite all the furore over phosphates in laundry products, no single chemical to date has been invented/found to do all the things phosphates can when it comes to laundry/dishwashing.
L.