Popular retailer Costco has been testing checkout technology that members frustrated by the sometimes long lines at its warehouses may be happy to see.

Costco is testing a “scan-and-go” checkout system similar to Sam’s Club, allowing customers to scan items with their phones, build a digital cart, and pay through an app. Initial test results have been positive,

Coca-Cola issued an initial recall announcement to Costco members on Monday, warning that select packs of Topo Chico Mineral Water could be contaminated with Pseudomonas aeruginosa. In its letter, it said the cases were sold at Louisiana and Texas-based warehouses.

Among the stores impacted by the Topo Chico mineral water recall are select Costco locations in Texas and Louisiana.

A popular brand of sparkling water has issued a recall over possible contamination fears. On Monday, Coca-Cola sent a letter to Costco members announcing that they were voluntarily recalling Topo Chico Mineral Water due to the possible presence of Pseudomonas aeruginosa,