They call me The Quark

Good day. I've been trying to make a good electrolysis kit for various experiments but I have a terrible yield. I used two lead electrodes (also tried graphite rods but they wear out fast) each about 1 cm in diameter submerged 7cm under the water fairly close to eachother, connected to a 12v 10a DC power supply in a glass jar. I've tested it on salt but found my setup only splits 0.5g per hour (ran it for a few hours), pointless for harvesting decent amounts of metal, etc. I seem to have gotten similar amounts with both types of electrode. What could I be doing wrong? Do I need bigger electrodes? I've seen claims I should be able to split several grams per hour, but one of those results was from google Gemini so I'm taking it with a pinch of salt (C'mon you gotta admit that was funny right? No? OK I'm sorry). Any help would be greatly appreciated. Thank you.