Last year I used a 50lb bag of sand in a giant ziploc bag to hold my ladder in place. Getting that in and out of the pool was very hard for me, plus the bag broke open, blah...I was wondering if it would be ok to use 2 20lb dumb bells, the plastic ones? I saw a thread about making weights using PVC and cement, but I am not that handy, don't have tools, I'm lucky if I can change a light bulb.