Customer service and follow up is very poor. Beyond poor in fact. Product was very delayed on order time... pleased with product itself, but company had full payment up front and was approximately 8 weeks delayed on estimated delivery tine. Subsequently ordered additional chemicals for hot tub - hugely delayed. Reordered through alternative supplier who delivered next day ! When Danz finally delivered our order, it was incomplete, but with no paper-work to state that they knew further item to follow. Still waiting for final part of our order, approximately 6 weeks after delivery of main order when "missing item would be delivered as soon as in stock" ...... how long does it take to re-stock chemical test strips ???!! Would not recommend buying anything through this company, sadly