This is how I do it too since the pump broke. Tried going the drill route but the nutes ended up seizing the chuckI just use a big wooden spoon and stir the res every time I go past it...since it's right next to bedroom doorway that's at 5 to 10 times a day.




As far as the medium, I've got Cultivation Nation by Fox Farms & I also got some Coco Loco to mix in, (10%). My last run in coco, (but not autopots). I mixed it 50/50 with the bottom 1/2 of the 5 gallon pot, with CN in the top half. I worried about ph the whole grow, but kept it around 6.2 and the girls did fantastic. I ordered some Recharge, but i't's not going to get here in time. But I still got enough Great White to get things started. I'm getting ready to smoke a little more & finish potting up. The plan is to bubble 5 gallons of water, add cal/mag & light nutes & water them in tomorrow. I'll be dropping seeds to soak tomorrow, if everything goes as planned! As always, questions comments, rants & raves are welcomed & encouraged! Thanks for stopping by & happy growing!
Anyways, smoking one & sending good vibes for perfect germination! 
(Dirty mind - what can I say!) I put them back in the oven on the germ mat & I'm going to leave them in darkness for 24 hours & make a decision from there. Germinating in the oven takes me back to my younger years, when I use to take all my bag seed & germ in paper towels. It didn't take much moisture as the oven was in the basement next to the room where I lived as a teen, (I called it the cave back then, cause it had a hanging bed & it flooded sometimes, lol).
I never did get much done after germination though, (had a couple lucky years). Anyways, just wanted to update & post a pic, (you really can't see nothing). Thanks for stopping by happy growing!