13 Watt PLS UVC Germicidal Replacement Bulb GX23 Base ? PLS Type H Glass ? GX23 Base ? 13W - 7" (180mm) ? Quartz Glass Construction ? Use in Pond Filters, Water Purifiers, Etc. ? For Best Results Change Every 6 Months or 8000 hours. We sell Many Pond Products online, Check out our Store!! Terms and Conditions. We use PayPal for taking payment, if you wish to purchase via other methods please email us for customer service. Sales Tax will be added to all shipments to New Jersey. We always try to combine purchases, please contact us directly for a personal service. You will be notified on the day that your goods have been dispatched via e-mail with tracking which is used on all purchases. Please note that if there are any problems, contact us first via e-mail giving full details of any problem along with your user ID. We use USPS and UPS as our chosen carriers shipments to Hawaii, Alaska Puerto Rico may incur surcharges, contact will be made to advise before shipment at which point the order can be canceled if desired. Orders placed on Saturday/Sunday Public Holidays will be processed next working day. We pride ourselves on excellent feedback, if any part of the buying experience is not to your satisfaction, please contact us to rectify before leaving feedback. By committing to buy you are agreeing to the Terms Conditions stated above.