NOTE TO BUYERS - See Image 5: Competitors and Amazon Customers who do not read are posting false and misleading details on Amazon product reviews, that is not validated by Amazon . See image 5 for more details. GUARANTEED TO FIT REMINGTON SOLAR IONIZER - See image 3: Anodes have been tested and guaranteed to fit the ionizer unit. One end of anode fits the ionizer unit and other end fits the Wingscrew supplied with anode. PREMATURE ANODE REPLACEMENTS: 95% of customers replace the anode with more than 80% mineral remaining on old anode. Anodes are sacrificial, and designed to degrade. If anode is looking new or barely degraded, Solar ionizer unit is inoperative. Solar ionizer unit will always ionize regardless anode condition, as long it is installed on unit. Common misconception to replace anode to get solar ionizer to function is an INCORRECT PROCEDURE. DO NOT CLEAN ANODE: Any Solar Ionizer automatically cleans the anode during ionization process. Power from solar panel is applied at center of an anode that cannot be cleaned. Cleaning outside an anode with abrasive material(s), will result in NO BENEFITS other than: 1. Frequent anode replacements 2. Significantly increase costs due to wasted mineral ions 3. Damage to solar ionizer unit 4. Time spent on a cleaning procedure that's not needed and not useful. ANODE DIMENSIONS: Refer to 2nd image of this ad. Anode size is optimized to save on chlorine use by maximizing mineral ions in water. IMPORTANT: LARGER DIAMTER ONE INCH ANODE contain impurities that significantly decreases ionization, reduces clearance between coil and anode causing unit not to work and may cause permanent damage to Solar ionizer head unit due to short circuits. DO NOT CLEAN ANODE: Solar Ionizer unit cleans the anode automatically during the ionization process. Wattage from solar ionizer is applied at center of anode and this cannot be cleaned. Therefore cleaning the outside an anode with any abrasive materials, the following results with NO BENEFITS will occur: 1. Frequent anode replacements 2. Significantly increase costs due to wasted mineral ions 3. Damage to Solar ionizer unit 4. Time spent on a cleaning procedure that's not needed and not useful