Multi-select problem: How does the next paragraph end?

How to maintain a planter
Check that your planter is draining freely during each watering.
If your planter doesn't drain freely after several waterings, the drainage may be blocked. Look underneath the planter and check the drainage holes.

OPT: (I). Your planter will then need further water, which can help keep those problems at bay. If your planter needs to be watered more frequently, rainwater you can purchase from your local hardware store to ensure it drains well. (II). In some cases, you may be able to fix the problem, but in some situations it may need a fixed amount of watering each week. Go to a home improvement store or even a home repair store that sells planter fluids. (III). If you have mechanical plants growing in the planter, then water may drip from the top of the planter, or the planter may not drain at all, even if the planter drains regularly. Check the depth of the planter deeper to see if there is, in fact, enough water to drain the planter. (IV). If they don't appear to be blocked, you may need to change out the compost mix because it can decay and become soggy and waterlogged over time. Also check your planter after rain.
(IV).