public function filter($column, $value, $comparison = '=')
    {
        $foundFilterIndex = -1;
        if ($column) {
            foreach ($this->filters as $key => $info) {
                if ($info[0] == $column) {
                    $foundFilterIndex = $key;
                    break;
                }
            }
        }

        if ($foundFilterIndex > -1) {
            $this->filters[$foundFilterIndex] = array($column, $value, $comparison);
        } else {
            $this->filters[] = array($column, $value, $comparison);
        }
    }