As per phone conversations with rice importers and receipt of confirmation letters from them, Rabbi Eliyahu Ben Haim has confirmed that the following brands of rice are 100% pure, are not enriched, and have no additives or preservatives. Therefore, they are suitable for use on Passover.  The brands are as follows:  Lalquila, Shahzadeh, Pari, Royal, Zebra, Deer, Empire, and Gold & Quilla. 

Even though these rices are pure, Jewish Law requires them to be cleaned at least 3 times and washed thoroughly before use for Passover.  Please avoid any enriched rice.

Chag Kasher Ve Sameach.